Where can I buy Green House Seed Co. genetics?

Green House sells directly through its Amsterdam catalogue, the coffeeshops it operates, and a global reseller network. The brand has one of the largest seed-bank distribution operations in Europe.

Is Green House Seed Co. still active?

Yes. The Arjan Roskam program continues to release new crosses every season, with the Strain Hunters research arm still working from the landrace collection assembled during the late-2000s field trips. The coffeeshops feed end-user data back into the breeding program.

What are Green House's most famous strains?

White Widow and Super Lemon Haze are the two reference strains and both held the catalogue's commercial center for years. Hawaiian Snow and Super Silver Haze sit in the same upper tier and continue to win awards through European Cup circuits.

Netherlands · founded 1985

Green House Seed Co.

Green House Seed Co. has logged more Cannabis Cup wins than any other Dutch breeder since the mid-1990s, with Arjan Roskam's name appearing on the Cup awards list every year for nearly a decade. The Strain Hunters program documented landrace collection trips through Malawi, Colombia, Nepal, and India in the late 2000s, and several of those landraces sit in current crosses. Super Lemon Haze and White Widow remain the catalogue's reference points, but the breeder also releases short-finish hybrids targeted at home growers working in tents. The Amsterdam coffeeshops give Green House an unusual position — the same flower is sold over the counter, which means feedback from end-users feeds directly back into the breeding program. The catalogue covers more than a hundred strains and is one of the only European seed banks running a true full-cycle research operation.

Reviewed 2026-05-23

Notable releases

Super Lemon Haze · White Widow · Hawaiian Snow · Super Silver Haze

Green House Seed Co. catalogue at a glance

Computed visualizations of the 9 strains documented in the Lockbox library for Green House Seed Co..

Haze5
Trainwreck2
Widow line1
Kush / Grape1

Strain family breakdown across 9 entries from Green House Seed Co..

Strain family breakdown.

THC content distribution.

Flowering windows.

Timeline

1985
Founded by Arjan Roskam in Amsterdam
1997
White Widow wins Cannabis Cup
2008
Super Lemon Haze sweeps the Cup
2010
Strain Hunters documentary series begins
Today
Full-cycle research operation across coffeeshops and lab

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Green House Seed Co. FAQ

Where can I buy Green House Seed Co. genetics?: Green House sells directly through its Amsterdam catalogue, the coffeeshops it operates, and a global reseller network. The brand has one of the largest seed-bank distribution operations in Europe.
Is Green House Seed Co. still active?: Yes. The Arjan Roskam program continues to release new crosses every season, with the Strain Hunters research arm still working from the landrace collection assembled during the late-2000s field trips. The coffeeshops feed end-user data back into the breeding program.
What are Green House's most famous strains?: White Widow and Super Lemon Haze are the two reference strains and both held the catalogue's commercial center for years. Hawaiian Snow and Super Silver Haze sit in the same upper tier and continue to win awards through European Cup circuits.