Last updated: October 22, 2026
The Green House Seed Company is the Amsterdam seed brand of Arjan Roskam, the man behind the Green House coffeeshops and the Strain Hunters documentaries. It sells only feminized seeds (photoperiod, autoflower and CBD) through two main stores: greenhouseseeds.nl for Europe, the UK and much of the world, and a US store run by Strain Hunters USA in Denver. The site also links to stores for Thailand and South Africa. Our verdict: a legitimate, long-running breeder with famous genetics and a real (but strict) germination guarantee, held back by mixed grower feedback, limited support hours and policy pages that do not always agree. We score it 6.4/10.
This review is based on Green House Seeds’ published policies, current prices and checkout shipping rates on both stores, and independent customer feedback. All facts were checked on October 22, 2026.
Green House Seeds at a Glance
| Item | Details |
|---|---|
| Based in / owner entity | Amsterdam, Netherlands. Operated by GHSC Trading B.V. (Dutch Chamber of Commerce 33273781). US store: Strain Hunters USA, Denver, Colorado. |
| Ships to | US: yes, through the separate US store (26 states plus DC). UK: yes. EU: yes, except the Netherlands. Canada: no. Australia: yes (stealth option only). |
| Ships from | European store: the Netherlands (PostNL and other carriers). US store: within the US (USPS and UPS). |
| Shipping cost | Europe and UK: from €7.50 (untracked) or €7.90 (tracked), free regular post above €100. Stealth in merchandise: €22 to €22.50 in most of Europe, €37.50 to Australia. US store: $8, free above $99. |
| Delivery time | Europe and UK: 3 to 5 days tracked, 3 to 12 days regular post, 3 to 15 days stealth. US: processed within 3 days, then most shipments take 3 to 6 days. |
| Payment methods | European store: Visa, Mastercard, Amex, bank transfer, cash by registered mail (euro only). US store: Visa and Mastercard. |
| Germination guarantee | European store: yes, but you must return the unsprouted seeds, original packaging and proof of purchase with photos. Not offered where germination is illegal. US store: none published. |
| Seed types | Feminized photoperiod, autoflower and CBD seeds. We found no regular seeds. |
| Price per seed | About €5.70 (NL5 Haze Mist, 10-pack) to €17.50 (single seed of a new release) on the European store; about $7 to $14 on the US store |
| Facts checked | October 22, 2026 |
Buying Green House Seeds from the USA
The main European store will not sell seeds to the US. Its homepage tells visitors in the USA, the Netherlands and Canada that they cannot buy seeds there, and its terms and conditions state that the company does not send cannabis seeds to the United States and does not answer seed questions from people located in the US.
US buyers are sent to a separate store instead: Green House Seed Co. USA, operated by Strain Hunters USA from 2921 W 38th Ave, Denver, Colorado. It sells the seeds as hemp: the site says every product contains no more than 0.3% Delta-9 THC, posts a certificate of analysis for each strain, and says the seeds are “intended for use as souvenirs, for storage, and for genetic preservation purposes only”. The catalog is smaller (about 90 products) and comes in 5- and 10-seed packs only.
According to the US shipping page, the store ships to 26 states plus Washington, DC: Alaska, Arizona, Arkansas, California, Colorado, Connecticut, Florida, Hawaii, Illinois, Maine, Maryland, Massachusetts, Michigan, Minnesota, Missouri, Montana, Nevada, New Mexico, New York, Ohio, Oklahoma, Oregon, Rhode Island, Vermont, Virginia and Washington. Orders go out by USPS or UPS within 3 days of payment (Monday to Friday) and most arrive in 3 to 6 days. Shipping is a flat $8, free above $99. Seeds arrive in their branded packs inside a plain bubble envelope without the company logo, and P.O. boxes are accepted. If your state is not on the list, the US store does not ship to you.
The US store’s terms list Visa and Mastercard as payment methods and allow returns for a refund (minus original shipping) within 30 days of shipment if products are in original condition, after you get a return authorization. Damaged, missing or wrong items must be reported within 14 days with photos. We found no germination guarantee on the US store. Its contact page says the phone line is currently unmanned and that email gets a reply within 24 hours on weekdays.
Who Green House Seeds Is
The European store is run by GHSC Trading B.V., registered with the Dutch Chamber of Commerce under number 33273781, which also owns the “Green House Seed Co”, “Strain Hunters” and “Green House Feeding” trademarks. Note that the site gives two addresses: the footer lists Kabelweg 22, 1014 BB Amsterdam, while the terms list Keienbergweg 51, 1101 GA Amsterdam Zuidoost.
The founding date depends on whom you ask. The site footer shows a copyright line running from 1986 to 2026. On his profile page, Arjan Roskam says he started growing exotic strains in 1985, opened the first Green House coffeeshop on the Tolstraat in 1992, and won the overall prize at the 6th High Times Cannabis Cup in 1993. Wikipedia dates the seed company itself to 1994, when Roskam co-founded it in Amsterdam with Scott Blakey, the breeder known as Shantibaba.
Green House says it has won more than 40 High Times Cannabis Cups and 17 Highlife Cups, and Roskam markets himself as the “King of Cannabis”. Treat the count as the company’s own claim: Wikipedia’s profile of Roskam lists 32 Cannabis Cups, and the company’s own award list also counts hash, product and booth prizes alongside strain wins. Its most recent listed results are a 1st (King’s Juice) and 2nd (Lemon Orange) at the 2024 Prempavee Ganja Cup and a 3rd (HighCloudZ Auto) at the 2024 Autoflower World Cup.
Who bred which strain
Credit for the most famous Green House strains is shared, and in some cases disputed:
- White Widow. Green House lists it as the 1995 High Times Cannabis Cup winner. Wikipedia credits Scott Blakey (Shantibaba), who developed it while working at Green House. According to his Wikipedia profile, Blakey later took his parent plants to Mr. Nice Seedbank, where his version was renamed Black Widow.
- Super Silver Haze. One of the Cup winners from the Roskam and Blakey years. Wikipedia describes Blakey as “widely believed” to be its originator, and notes that Roskam’s claims of involvement in selecting White Widow and Super Silver Haze have been questioned.
- Super Lemon Haze. A cross of Lemon Skunk and Super Silver Haze. Wikipedia credits Franco Loja as the breeder; Green House’s own product page credits “Green House Seeds” and lists 1st place at the High Times Cannabis Cup in 2008 and 2009.
- Arjan’s Haze #1. Won the Cannabis Cup in 2006 (Wikipedia).
Wikipedia says Blakey sold his share of the company to Roskam in 1998. Neither side’s version of the split is independently documented, so we do not take a position on it. What matters for buyers is that Green House still sells its own lines of these names, and that some growers on forums prefer Blakey’s Mr. Nice versions (see Reputation).
Strain Hunters and Franco Loja
In 2008 Roskam started Strain Hunters, a documentary series in which the team traveled to collect landrace cannabis (Wikipedia). Franco Loja, Green House’s breeder and Roskam’s partner for almost 20 years, was the face of many of those trips. He died on January 2, 2017, aged 42, after contracting malaria in the Democratic Republic of the Congo, High Times reported. The Franco’s Fullgas! strain (Exodus Cheese x Sherbert OG) is named in his honor.
Catalog and Seed Types
Every seed on the European store is feminized. On October 22, 2026 the feminized section listed about 125 products (including bundles), among them 27 autoflowers and 8 CBD strains. We found no regular seeds. The site sorts strains by type (autoflower, CBD, hybrid, mostly indica, mostly sativa), by family (Arjan’s Haze, Kush, White family), by climate zone and by effect.
Classics include White Widow, Super Silver Haze, Super Lemon Haze, Exodus Cheese (which Green House markets as “the only original Cheese”), Neville’s Haze, The Church, Great White Shark, Himalaya Gold, White Rhino and Green House’s own Jack Herer (Haze x Red Skunk). Newer work sits in the USA Genetics line, such as Lemon Orange, Franco’s Fullgas!, Banana Krumble, Wonder Pie and Persian Pie, plus 2026 releases like Super Boof x Motorbreath and the Air Lemon crosses. If you are deciding between seed types, our guide to feminized vs autoflower vs regular seeds explains the trade-offs.
Strain pages give genetics, sativa and indica share, THC, CBD and CBN percentages, flowering time, yield and a list of awards. Green House also sells its Green House Feeding nutrients, clothing (including a Patta x GH collaboration), DVDs and smoking accessories.
Prices and Pack Sizes
The European store sells most strains in 1, 3, 5 and 10 seed packs. These are the prices we saw on October 22, 2026:
| Strain (type) | 1 seed | 3 seeds | 5 seeds | 10 seeds |
|---|---|---|---|---|
| White Widow (feminized) | €11.00 | €25.00 (€8.33/seed) | €35.00 (€7.00/seed) | €65.00 (€6.50/seed) |
| Super Lemon Haze (feminized) | €13.00 | €30.00 (€10.00/seed) | €42.00 (€8.40/seed) | €75.00 (€7.50/seed) |
| Lemon Orange (feminized) | €15.00 | €40.00 (€13.33/seed) | €55.00 (€11.00/seed) | €90.00 (€9.00/seed) |
| Super Boof x Motorbreath (feminized, new release) | €17.50 | €47.00 (€15.67/seed) | €63.00 (€12.60/seed) | €105.00 (€10.50/seed) |
The cheapest per-seed price we found was NL5 Haze Mist at €57 for 10 seeds (€5.70 a seed). Autoflowers such as Super Lemon Haze Auto cost the same as their photoperiod versions (€13 for one seed, €75 for ten). Prices include VAT.
On the US store, packs come in 5 or 10 seeds. A.M.S. costs $40 for 5 and $70 for 10 ($7 to $8 a seed), Super Lemon Haze $50 and $90 ($9 to $10), Jack Herer $45 and $78, and the new Air Lemon $70 and $120 ($12 to $14). So expect roughly $7 to $14 per seed in the US.
European buyers have a 14-day right of withdrawal under the terms, and damaged products must be reported by email within three days. Returns go through a form sent to [email protected].
Shipping by Region
The European store does not publish a rate table. Its payment and shipping page says costs and delivery times are calculated at checkout by weight and destination. We ran the checkout’s shipping estimator on October 22, 2026 with a single seed in the cart (€11):
| Destination | Options and price |
|---|---|
| United Kingdom | PostNL registered with tracking, 3 to 5 days: €7.90. Regular post without tracking, 3 to 12 days: €7.50 (€10 on larger orders). |
| Germany, France, Spain, Ireland, Austria | PostNL registered: €7.90. Regular post: €7.50 (€10.50 to Germany on larger orders). KDZ Road Express, 3 to 5 days: €14.50. Stealth delivery in merchandise with tracking, 3 to 15 days: €22 to €22.50. |
| Australia | Only stealth delivery in merchandise with tracking, 3 to 15 days: €37.50. |
| New Zealand, Norway, Japan | Regular post: €7.50. Stealth delivery: €32.50. |
| United States, Canada, Netherlands | No seed sales from the European store. US buyers can use the US store (see above). |
Free shipping. The promotions page offers free shipping by regular post on orders above €100. In our test, a €99 cart still paid for shipping, while a €110 cart shipped free to the UK (including PostNL registered) and Germany. The Australian stealth option stayed at €37.50.
Canada. The terms say Green House does not ship seeds to Canada “at the moment”, because sending a live product from the EU to Canada requires certification.
Dispatch and customs. For bank transfers, the payment page promises shipping within one working day after the money arrives; unpaid orders are canceled after 21 days. Under the terms, orders seized or destroyed by customs are not resent or refunded, so check your country’s import rules first.
Shipping to the US does not make growing legal everywhere. Seed and cultivation laws differ by state, and the federal hemp definition is changing in stages between November 12 and December 11, 2026 (P.L. 119-37, section 781, as amended by P.L. 119-103), which may affect how cannabis seeds can be sold and shipped (Congressional Research Service summary). Check your state and local rules before you order.
Germination Guarantee: What Green House Actually Promises
Green House does have a germination guarantee, though it is easy to miss because it sits in article 3 of the terms and conditions, which state that the company “Guarantees the viability of all of its seeds”. Elsewhere the same terms call it a “limited germination guarantee”. The conditions are strict:
- You must photograph the entire germination process.
- You must send the unsprouted seeds back to Green House, together with the original packaging and proof of purchase.
- Seeds are not replaced if you did not follow Green House’s germination instructions or do not return the original packaging.
- The guarantee only covers customers in countries where germinating the seeds is legal. Green House states it will not replace seeds for customers in countries where germination is illegal.
- Seeds sold separately by a retailer without original Green House packaging are not covered.
The terms set no claim deadline, no germination percentage and no replacement formula. Claims go through the contact form (“Related to growing or germination”). The country exclusion matters for UK buyers: growing cannabis is an offense under section 6 of the Misuse of Drugs Act 1971, so a UK customer should not count on a replacement. The US store publishes no germination guarantee at all.
Green House’s “Germination Tests” page was empty when we checked, so there is no published test data behind the seeds. Grower reports are mixed (see Reputation).
Payment Methods
The European store’s payment page lists three ways to pay:
- Credit or debit card (Visa, Mastercard and Amex) through payment providers. Your statement shows “greenhouseseeds.nl / +31203080918”.
- Bank transfer to a Dutch SNS Bank account, with your order ID as reference. Bank charges are your responsibility.
- Cash by registered mail in euros, with your order ID and invoice. Green House takes no responsibility for money lost in the post.
The page’s code also contains iDEAL, Sofort and Coingate (crypto) sections, but they are hidden from view, so we do not count them as available. We found no PayPal. The US store accepts Visa and Mastercard.
Deals, Loyalty and Discount Codes
As of October 2026 we found no public Green House Seeds discount or coupon code on either store, so treat codes on third-party coupon sites with caution. The European store’s promotions page listed these automatic deals on October 22, 2026:
- Double the Order on a selection of feminized strains marked “Double your order”. In our test, one Lemon Orange seed became two at checkout.
- A free Papaya Sour Spritz seed with every order.
- Free stashbags with certain strains, and a free mineral feeding starter kit on orders above €200.
- Free shipping by regular post above €100.
- Clothing and feeding discounts of 5% to 20% when you buy two or more items, 10% off Patta and Propaganda items (End of Summer 2026), plus a separate 25% clothing discount listing.
We found no points or loyalty program. The store runs an affiliate program and a newsletter that promises “exclusive discounts”.
Customer Service
The European store offers:
- Phone: +31 20 30 80 918, Monday to Friday, 13:00 to 17:00 (CEST)
- A contact form with topics such as germination, payment and shipping
- WhatsApp, linked from the site menu
- Email: [email protected] (named on the returns page)
Four hours a day on the phone is a narrow window. The terms promise an answer to complaints within 14 days, and Dutch law applies to disputes. On the US store, the phone line is “currently unmanned” and email is answered within 24 hours on weekdays, by the store’s own account.
Public complaint data is thin. SmartCustomer (formerly Sitejabber) had no reviews for greenhouseseeds.nl or greenhouseseeds.us on October 22, 2026, and we found no Better Business Bureau profile for the US company. On Reddit, one buyer added a comment to a 2024 r/microgrowery thread saying that an order placed in December 2025 arrived with 10 of 20 seeds and that calls and emails went unanswered, while another in the same thread called the service “very friendly” and shipping quick.
Reputation
Green House is one of the best-known names in cannabis seeds, and also one of the most debated. Independent review platforms offer little: as noted above, SmartCustomer has no reviews for either store and we found no BBB profile. Forum feedback is the main source, and it splits sharply:
- “What’s Everyone’s Personal Experience With Green House Seeds” (r/microgrowery, August 2024, 100+ comments): praise for Super Silver Haze, Exodus Cheese, King’s Juice and Wonder Pie next to reports of hermaphrodite Exodus Cheese plants, small or pale seeds and failed germination. Several commenters bring up the Shantibaba split and recommend Mr. Nice for the older lines.
- “Has anyone here tried Green House Seeds Co?” (r/microgrowery, May 2025, 28 comments): mostly positive replies about King’s Juice, The Church, Super Lemon Haze and the newer strains; one commenter confirms the .nl and .us sites belong to the same breeder.
- “Greenhouse Seed Co” (r/microgrowery, July 2025): a grower reports poor germination on three autoflower strains.
- “Why so much hate on green house seeds?” (r/microgrowery, October 2016, 40+ comments): an older thread in which the criticism centers on the company’s feminized-only range and the ownership of the original genetics rather than on order problems; several growers report good Neville’s Haze, Bubba Kush and Super Lemon Haze plants.
These are individual accounts that we cannot verify, but the pattern is consistent: many growers are happy with the plants, a minority report germination failures or hermaphrodites (Exodus Cheese comes up more than once), and part of the criticism is about the founder and the history of the genetics rather than the seeds. If you want to check plant sex early, our guide to male cannabis plants covers the signs.
Website and Grow Resources
The European store is easy to browse, with filters by type, family, climate and effect, detailed strain pages, a flavor wheel, a strain statistics page and a terpene table. Shipping rates are shown at checkout, and an order tracking page is available.
The weak spot is the information around the shop. Policies are spread over the terms, the payment page and the promotions page; the About page still speaks of “over 20 strains” and “No sales of seeds to USA” even though a US store now exists; Arjan’s profile quotes US legalization figures from years ago; and the footer and terms give different company addresses. When in doubt, go by the terms and the checkout.
Who Green House Seeds Suits, and Who Should Look Elsewhere
A good fit if you: want classic Amsterdam genetics such as Super Lemon Haze, Super Silver Haze or Exodus Cheese from the brand that sells them under those names; live in Europe and are happy with feminized seeds and single-seed packs; live in one of the 26 US states (plus DC) served by the US store; or can use the “Double the Order” deals and the free shipping above €100.
Look elsewhere if you: live in Canada or the Netherlands, or in a US state the US store does not serve; want regular seeds; live where germination is illegal and want a germination guarantee; want a guarantee on a US order; need PayPal; or prefer the versions of White Widow and Super Silver Haze tied to their original breeder.
Scoring Summary
| Category | Score |
|---|---|
| Seed Quality and Germination | 6.3/10 |
| Shipping and Delivery | 6.5/10 |
| Customer Service | 6.0/10 |
| Product Range | 7.0/10 |
| Price and Value | 6.5/10 |
| Website and UX | 5.9/10 |
| Overall | 6.4/10 |
Green House Seeds scores 6.4/10 overall. Product Range is the strongest category at 7.0/10: about 125 feminized products, from Cup-winning classics to new USA Genetics crosses, with autoflower and CBD versions, held back by the lack of regular seeds. Shipping and Delivery and Price and Value both land at 6.5/10. Shipping rates are clear at checkout, free above €100 in Europe and above $99 in the US, with tracked and stealth options, but there is no shipping to Canada or the Netherlands, the US store covers only 26 states plus DC, and Australia gets only a €37.50 stealth service. Prices are mid-range (about €5.70 to €17.50 a seed), helped by “Double the Order” deals and a free seed with each order, without a loyalty program.
Seed Quality and Germination sits at 6.3/10: a real germination guarantee in the European terms, but with strict conditions, no cover where germination is illegal and none on the US store, plus mixed grower reports. Customer Service gets 6.0/10 for several channels (phone, form, WhatsApp, email) offset by four phone hours a day, an unmanned US phone line and some unanswered-complaint reports. Website and UX is the weakest at 5.9/10: a good catalog, but outdated About pages and conflicting addresses.
How Does Green House Seeds Compare?
| Seedbank | Our score | Germination guarantee | Shipping to the US | Loyalty and deals | Best for |
|---|---|---|---|---|---|
| Green House Seeds | 6.4/10 | EU store only, return seeds, packaging and photos | US store: $8, free over $99, 26 states plus DC | None listed | Fans of Amsterdam classics like Super Lemon Haze and Exodus Cheese |
| Sensi Seeds | 6.8/10 | Replacement, no percentage stated, photo proof | $6.25, free over $75 via sensiseeds.us (USPS) | None listed | Classic Dutch genetics, EU and UK buyers |
| Barney's Farm | 6.8/10 | US store only, if none or nearly all seeds fail | Free over $50 (else $6), ships from California | None listed | Buyers after Amsterdam classics, Cali strains and F1s from the breeder |
| Dutch Passion | 6.8/10 | No written guarantee; case-by-case review | $7.95 flat via USPS, ships from Illinois (US store) | VIP points: 5% back on seed purchases | Growers who want original Dutch classics and regular seeds |
| Mr. Nice Seedbank | 5.5/10 | None found; refunds not permitted | €35 at checkout, but shipments paused since Aug 2025 | None listed | Breeders wanting Shantibaba's regular Widow and Haze lines |
Scores and details come from each seedbank's own review on this site and update when that review is re-checked.
For other options, see our reviews of Sensi Seeds, Barney’s Farm, Dutch Passion and Mr. Nice.
Final Verdict
Green House Seeds is a legitimate, long-established seed company with a genuine place in cannabis history, even if the credit for its most famous strains is shared with breeders who have since left. For European buyers it is straightforward: clear checkout shipping rates, free shipping above €100, frequent “Double the Order” deals and a germination guarantee, as long as you keep the packaging, photograph the process and live where germination is legal. US buyers in the 26 covered states (plus DC) can order from the Denver-based US store, with $8 shipping or free above $99, but without a published guarantee.
The gaps are concrete: feminized seeds only, no Canada, strict guarantee terms, short phone hours, and grower feedback that ranges from excellent to disappointing. If those are acceptable, Green House remains a sensible place to buy its own classics. To compare it with the rest of the field, see our seedbank review hub.
Frequently Asked Questions
Where is Green House Seeds based, and who owns it?
Green House Seeds is based in Amsterdam. The European store is operated by GHSC Trading B.V. (Dutch Chamber of Commerce 33273781), the company of founder Arjan Roskam. The US store is run by Strain Hunters USA in Denver, Colorado.
Does Green House Seeds ship to the USA?
Not from greenhouseseeds.nl, but the separate Green House Seed Co. USA store ships to 26 states plus Washington, DC, for $8 or free above $99. Seed and cultivation laws differ by state, so check your local rules before you order.
How long does Green House Seeds take to ship?
From the European store, tracked PostNL delivery takes 3 to 5 days, regular post 3 to 12 days and stealth delivery 3 to 15 days, according to checkout. The US store processes orders within 3 days and most arrive 3 to 6 days later.
Where does Green House Seeds ship from?
European orders ship from the Netherlands with PostNL and other carriers. US orders ship within the United States by USPS or UPS.
Is Green House Seeds legit?
Yes. It is a registered Dutch company that has sold seeds under the Green House name since the 1990s and runs a US store through Strain Hunters USA. Grower feedback is mixed, with reports of both strong plants and germination problems.
Does Green House Seeds have a germination guarantee?
The European store does, with strict conditions: photos of the whole germination process, and the unsprouted seeds, original packaging and proof of purchase sent back. It does not apply where germination is illegal. The US store publishes no guarantee.
What payment methods does Green House Seeds accept?
The European store accepts Visa, Mastercard and Amex, bank transfer and cash in euros by registered mail. The US store accepts Visa and Mastercard. We found no PayPal option.
Are there Green House Seeds discount codes?
We found no public discount code in October 2026. Instead, the store runs automatic deals: “Double the Order” on selected strains, a free seed with every order and free shipping above €100.
Who bred White Widow and Super Lemon Haze?
Wikipedia credits White Widow to Scott Blakey (Shantibaba), who co-founded Green House with Arjan Roskam in 1994 and left in 1998. Wikipedia also credits Super Lemon Haze to Franco Loja; Green House lists it as the High Times Cannabis Cup winner in 2008 and 2009.
What Changed in This Update
This version adds the separate US store, which ships to 26 states plus DC. It corrects the germination guarantee, which does exist in the European terms with strict conditions, and the prices, which are per single seed rather than per pack. Shipping costs, free shipping above €100 and the stealth option are now taken from the checkout, and the history now follows independent sources on the founding year and on who bred White Widow and Super Lemon Haze.
Sources
- Green House Seed Company homepage (checked Oct 22, 2026): no seed sales to the USA, the Netherlands or Canada; award claims; coffeeshops
- Green House Seed Co. terms and conditions (checked Oct 22, 2026): GHSC Trading B.V., Chamber of Commerce number, address, germination guarantee terms, no US or Canada shipping, customs, withdrawal, damage reports, complaints
- Payment and shipping page (checked Oct 22, 2026): card, bank transfer and cash payment, statement name, dispatch after payment, shipping calculated at checkout
- Checkout shipping estimator on shop.greenhouseseeds.nl (checked Oct 22, 2026): rates and delivery times for the UK, Germany, France, Spain, Ireland, Austria, Australia, New Zealand, Norway and Japan; free shipping test at €99 and €110; “Double the Order” and free seed test
- Promotions page (checked Oct 22, 2026): free shipping above €100, Double the Order, free seed, stashbags, starter kit, clothing discounts
- About page and About Arjan Roskam (checked Oct 22, 2026): company claims on cups, history from 1985 to 1995, Franco Loja
- Cannabis Cup awards page (checked Oct 22, 2026): award list including hash, product and booth categories, recent results
- Contact page, site footer and returns page (checked Oct 22, 2026): phone, hours, WhatsApp, contact form, support email
- White Widow, Super Lemon Haze, Lemon Orange, Super Boof x Motorbreath, NL5 Haze Mist and feminized category pages (checked Oct 22, 2026): pack sizes, prices, awards, catalog size
- Green House Seed Co. USA store, US shipping and returns, US terms and US contact page (checked Oct 22, 2026): Strain Hunters USA, Denver address, hemp and souvenir disclaimer, states served, shipping cost and times, packaging, payment, returns, support; US product pages for A.M.S., Super Lemon Haze, Jack Herer and Air Lemon: prices
- Wikipedia: Arjan Roskam (checked Oct 22, 2026): 1994 co-founding with Scott Blakey, 1998 share sale, 32 Cannabis Cups, Arjan’s Haze #1 (2006), Strain Hunters (2008), disputed strain credit
- Wikipedia: Scott Blakey and Wikipedia: White Widow (checked Oct 22, 2026): White Widow credited to Shantibaba, 1995 Cup, Black Widow at Mr. Nice
- Wikipedia: Super Lemon Haze (checked Oct 22, 2026): bred by Franco Loja, parents, Cup wins 2008 and 2009
- High Times, January 4, 2017 (checked Oct 22, 2026): death of Franco Loja
- Misuse of Drugs Act 1971, section 6 (checked Oct 22, 2026): cultivation of cannabis in the UK
- SmartCustomer page for greenhouseseeds.nl and greenhouseseeds.us (checked Oct 22, 2026): no reviews; BBB web search: no profile found
- Reddit r/microgrowery threads from October 2016, August 2024, May 2025 and July 2025 (checked Oct 22, 2026): grower experiences
