Sour Diesel IBL by Reservoir Seeds
If there’s one breeding project that permanently altered the landscape of the forums over at ICMag, it’s the Sour Diesel IBL from Reservoir Seeds. Back in the day, the original East Coast Sour Diesel (ECSD) was a notoriously finicky, clone-only elite that nobody could get in seed form. Rezdog took it upon himself to change that. He started by crossing the ECSD cut with Soma’s NYC Diesel to inject some genetic diversity, and then he just started inbreeding the hell out of it. Over several years and multiple generations, he locked down those specific traits, culminating in the legendary 2007 IBL release.
Rezdog himself was always a polarizing figure in the community, with plenty of drama surrounding his name and some heavy accusations of snitching. But no matter how you feel about the man, you can’t deny the impact of his work. His Sour Diesel IBL became the absolute bedrock for modern "Sour" breeding. Huge names like Karma Genetics built their own empires using Rezdog’s stock as a foundation. Growers who hunted through the v2.5, v3, and the final IBL packs were consistently finding plants that mirrored the original clone's extreme vigor, aggressive stretch, and that eye-watering, lemon-skunk fuel reek.
Popping these seeds meant committing to a long ride, usually taking a full 75 to 90 days to finish flowering properly. The plants are lanky, sativa-dominant beasts that demand support for their heavy, resin-drenched colas. But the payoff is ridiculous. You get that authentic, sharp chemical gas profile and a soaring, racy high that just cuts through any tolerance. Original packs are practically impossible to find now, making them some of the most sought-after legacy beans in the entire cannabis world.
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Similar strains
| Breeder | Reservoir Seeds |
|---|---|
| Type | mostly sativa |
| Flowering time | ±75 days |
| Environment | Outdoors |
| Lineage | Sour Diesel × Double Sour Diesel |
| Descendants | Super Silver Sour Diesel Haze, Morning Flight, Sour Jack, Strawberry Diesel, Sour Amnesia, Basic Diesel / D39, Therapy Sour Diesel, Trom, San Fernando Diesel, Sour Kush, Chemdog Sour Diesel, Sour Power, Sour Sans Souci, 5G's Red x Sour Diesel, Bubba D, El Chapo, Sour Tangie, Head Seeds - G13-Diesel, Sour Fire Lost, Sugaree, Casey Jones, St Tropez Sour, Diamond Diesel, Sour Pink Grapefruit, Sour Larry, CannaVenture Seeds - Sin Diesel, Sour Deezal, Alpha Diesel, Dansk Diesel, Sour Neo, 303 Diesel, Chemdog dd, Sour Joker, Chemdog D x Sour Diesel, Sour Turbo, Super Sour Skunk, Purple Berry Diesel, Chocolate Diesel |
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🧬 Explore the family: Sour Diesel · Double Sour Diesel · Super Silver Sour Diesel Haze · Morning Flight · Sour Jack · Strawberry Diesel · Sour Amnesia · Basic Diesel / D39 · Therapy Sour Diesel · Trom
Ancestry Pedigree
Unknown or Legendary
Unknown or Legendary
Unknown or Legendary
Sensi Seeds
Sensi Seeds
The Seed Bank
Cultivators Choice
Original Strains
Original Strains
Original Strains
Unknown or Legendary
Original Strains
Unknown or Legendary
Unknown or Legendary
Unknown or Legendary
Cultivators Choice
Unknown or Legendary
Clone Only Strains
Reservoir Seeds
Unknown or Legendary
Soma Seeds
Original Strains
Mr Nice Seedbank
Unknown or Legendary
Original Strains
Growing Sour Diesel IBL: what to expect
As a sativa-leaning plant, plan for a big stretch after the flip (often 100–200%) — flip earlier than feels natural and keep training options ready. Sativa-leaning plants also generally prefer a lighter feed than heavy indicas. Growers familiar with Sour Diesel or Double Sour Diesel will recognize much of its behavior. Whatever the listing says, the cut in YOUR tent is the ground truth: log feedings, readings, and photos, and let the trends — not the label — drive decisions.
Sour Diesel IBL FAQ
How long does Sour Diesel IBL take to flower?
Sour Diesel IBL typically flowers in around 75 days after switching to a 12/12 light schedule. Individual phenotypes vary, so judge harvest readiness by trichome color, not the calendar.
Is Sour Diesel IBL an indica or a sativa?
Sour Diesel IBL is listed as mostly sativa.
What are the parents of Sour Diesel IBL?
Sour Diesel IBL was bred from Sour Diesel × Double Sour Diesel by Reservoir Seeds.
What environment does Sour Diesel IBL like?
Standard cannabis bands work well: VPD 0.8–1.1 kPa in veg and 1.0–1.4 kPa in flower, with humidity stepping down from 65–75% as a seedling to 40–50% in late flower. See the stage-by-stage table on this page.
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