Ultra Sour Chem OG doesn’t do subtle, and it doesn’t stick to one family tree either. Three lineages answer to the name, and every one of them shows up smelling like a gas station that sells lemons.
Origin 1: Firelands Scientific runs the best-documented version out of Ohio: MK Ultra crossed with Sour Diesel, then crossed again with TK-91. It leans sativa, and its lab averages show it: terpinolene, ocimene, and myrcene, a greener, zippier stack hiding under all that fuel.
Origin 2: Retail listings also put the name on MK Ultra x [East Coast Sour Diesel], a 70/30 sativa-leaning cross. That’s the same pairing sold as Ultra Sour, so check the label before assuming the Chem OG tag means anything.
Origin 3: Some strain databases take the name literally: Chemdawg x SFV OG. There’s no MK Ultra and no TK-91 in this one, just Chem and OG.
Whichever tree it comes from, the jar opens like a citrus squeeze at the pump: lemon and orange peel slicing through diesel and chemical funk, with a sneaky cheese undertone on some batches. Seasoned smokers keep coming back to Ultra Sour Chem OG strain effects for a clear, euphoric, get-up-and-go lift that keeps the head sharp while a light body high takes the edge off. It runs hot without redlining. Pucker up, fill up, ride out.
Good luck finding a seed pack with this exact name on it. Ultra Sour Chem OG mostly travels as cultivator stock, and Firelands Scientific keeps its version growing for Ohio shelves, smalls included. Nobody publishes official grow specs, but the family tree drops hints. Sour Diesel genetics like to stretch once the lights flip, so train early and leave headroom. Diesel and OG lines also get loud in late flower, and this one has three ways to stink up a room, so get the carbon filter running before the neighbors start asking questions.
