Old School Genetics

What Is Old School Genetics?

Old School Genetics (OSG) is an independent breeding and preservation project based in Barcelona, Spain. Breeding and creative direction are led by Oldman Green, who has been hunting, selecting and keeping cannabis cuts since the late 1990s. That is more than 25 years of hands-on selection work behind every pack.

The project grew out of clone-based work rather than marketing. Instead of chasing whatever is trending this month, OSG focuses on keeping classic references alive and pairing them with carefully chosen modern cuts. The tagline says it all: home of the old finest strains.

At Oaseeds, we see more and more growers looking for genetics with a clear story and real provenance. Old School Genetics fits that profile perfectly, whether you want a nostalgic skunk, a Kosher Kush hybrid loaded with resin, or a banana-forward sativa for the modern jar.

The Old School Genetics Philosophy

OSG builds its catalog around four simple principles:

• Provenance: clear parentage, with credit given to the original breeders and clone holders.
• Selection: every release has a defined breeding or preservation goal.
• Preservation: classic reference genetics are kept intact instead of being diluted.
• Honesty: no exaggerated claims and clear communication about expected variation.

For growers, that translates into seeds you can actually plan around. You know where the genetics come from, what they were selected for, and what kind of phenotypes to expect.

Popular Old School Genetics Lines

Kosher Kush Hybrids

This limited line uses OSG’s cut of the original DNA Genetics Kosher Kush, reversed by Oldman Green, as one of the parents. It is crossed with modern heavyweights such as RS11, GMO, Otter Popz, Red Velvet and Tropicana Cherry. The result is a series of feminized, indica-leaning hybrids with dense flowers, dark foliage and heavy resin output: RS11 Kosher, Garlic Kosher, Kosher Popz, Velvet Kosher and Black Cherries.

Karma Genetics Breeding Collab

OSG has a long-standing relationship with Karma Genetics, and several releases come from that friendship. Karma’s Road Dawg male (Stardawg x Biker Kush) appears in Petrol Skunk and Honey Gas. Blue Grape Fuel was built from Animal Cookies x Headstash seeds that Karma shared with Oldman Green, while Old Gas Station combines Old School Skunk with Karma’s Sour Diesel line. Petrol Skunk took 3rd place in the Indica category at the ICMAG Cup Barcelona 2019.

Oldies Never Die

This is where the name comes from. Old Widow 90’s preserves a White Widow cut kept since the late 1990s, OSG Cheese crosses the Exodus Cheese clone with Old Widow, and the Old School Skunk selections bring back the pungent, acrid skunk that many veteran growers remember.

Banana and Coast to Coast Series

For growers who want modern terpene profiles, Banana Gushers and Two Bananas build on Oldman Green’s Banana Ripple #17 selection, while Glueberriez (M.O.B. x Gorilla Glue #4) placed 2nd Best Indica at the Spannabis Champions Cup 2018.

Feminized and Regular Seeds

Most of the Old School Genetics range is available as feminized seeds, ideal for growers who want every plant to produce flowers. The Old School Skunk selections and Old Gas Station come as regular seeds, giving you both males and females. That makes them a great choice for pheno hunters, breeders and anyone who wants to select their own mother plant.

Why Buy Old School Genetics Seeds at Oaseeds?

When you buy Old School Genetics seeds at Oaseeds, you get authentic breeder packs shipped from the USA, with fast dispatch and discreet packaging. Whether you are chasing classic skunk funk, Kosher Kush resin or a gassy Karma collab, this is a catalog built by a breeder who still grows the way it was done in the old days, with modern selections to match.