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S1 Cannabis Seeds

S1 feminized cannabis seeds are an excellent choice for breeders, cultivators, and collectors alike. These seeds allow growers to preserve rare, clone-only strains and discover new phenotypes of their favorite cultivars.

The term “S1” means “first selfed generation.” Selfing is the process of crossing a plant to itself to make feminized seeds. This can be accomplished by using an ethylene-blocking spray such as colloidal silver to cause the mother plant to form pollen sacs. The pollen is then used to pollinate either the original mother plant or a clone of it.

When done correctly, selfing produces 100 percent feminized cannabis seeds with the same genotype as the mother plant. This allows growers to discover plants that are nearly identical to the original clone. It also serves to open the gene pool, producing rare phenotypes with recessive traits. When growing S1 seeds, you may even find some phenotypes that are better than the original mother.

For breeders, selfing is a quick, easy, and effective way to stabilize a strain. Rather than selectively breeding males and females for many generations, they can create a homozygous strain in just a few generations of selfing.

At Greenpoint Seeds, we offer a variety of S1 cannabis seeds bred from elite, clone-only cultivars such as Animal Cookies, Purple Punch, and Gorilla Glue #4. Shop our feminized S1 seeds today.

$25.00$190.00
$25.00$190.00
New
$28.00$240.00

Customer Reviews

Jeff says:

5

Grew great

2025-07-09 16:35:50 July 09, 2025

Cesar D. says:

5

#1

2025-07-09 10:56:57 July 09, 2025

Thomas H. says:

4

Always fast

2025-07-07 13:38:43 July 07, 2025

Matthew Mcconico says:

4

Killing it on prices

2025-06-27 01:41:39 June 27, 2025

Anonymous says:

5

Always updating are stuff

2025-06-26 23:21:13 June 26, 2025

Anonymous says:

5

Never any issues

2025-06-22 01:01:23 June 22, 2025

Anonymous says:

5

Never an issue.

2025-06-18 14:28:41 June 18, 2025

Brian B. says:

5

always incredible customer service

2025-06-13 17:42:06 June 13, 2025

Anonymous says:

5

Always the best .

2025-06-11 09:42:04 June 11, 2025

Stanford L. says:

5

I haven't needed any customer services. Shipping was prompt. No problems with germination.

2025-06-05 07:51:21 June 05, 2025

Matthew W. says:

5

Greenpoint seeds always produce a great plant

2025-06-03 18:48:02 June 03, 2025

Anonymous says:

5

This strain is by far one of the best strains I have smoked. The flavor profile is awesome and the smoke is true haze.

2025-06-03 13:07:35 June 03, 2025

Anthony L. says:

5

Great service and excellent product

2025-05-30 19:18:07 May 30, 2025

Matthew Mcconico says:

4

Great company. Spitting out genetics faster than you can grow them

2025-05-30 18:55:40 May 30, 2025

Matthew Mcconico says:

5

Consistent good gear. You can do the rest

2025-05-29 14:55:05 May 29, 2025