Double Grape vs Sour Stomper
Everything you need to know before buying seeds — THC, yield, difficulty, effects, and the best places to buy in 2026.
Quick Comparison
Double Grape Overview
Double Grape is Mephisto Genetics' crown jewel — an autoflower that tested at 31.8% THC, shattering the myth that autos can't compete with photoperiod strains on potency. This Grape Crinkle × Sour Stomper cross produces compact, densely-budded plants that reek of grape candy from mid-flower onward. The MephHeads community on Reddit considers Double Grape one of the greatest autoflowers ever created. For growers, Double Grape is remarkably easy for its potency level — the plants stay compact, flower quickly, and produce dense, trichome-coated buds that rival top-shelf dispensary flower. This is the strain that converts photoperiod purists to autoflower believers.
🌱 Growing Tips
Don't transplant — plant directly in the final container (3–5 gallon). Double Grape benefits from 20/4 or 18/6 light schedules. The compact structure means less training is needed, but gentle LST can increase yields significantly. Don't top autos — use LST only. The plants are moderate feeders; start nutrients at 25% strength and increase gradually. Harvest timing is critical — wait for at least 10–20% amber trichomes for the full grape candy experience.
Sour Stomper Overview
Sour Stomper is one of Mephisto Genetics' most beloved strains — a daytime autoflower that delivers genuine sativa-like energy in a compact plant that finishes in just 60–70 days. The Sour Crack × Toof Decay genetics produce buds with an intensely sour, almost effervescent citrus candy aroma that's unlike anything else in the auto world. Sour Stomper is the strain that proves autoflowers can deliver complex, nuanced terpene profiles that rival the best photoperiod genetics. For growers, it's one of the easiest and fastest autoflowers available — tiny plants that pack enormous flavor and potency into a small space.
🌱 Growing Tips
Sour Stomper stays very compact — perfect for small tents, closets, or micro grows. Don't transplant; plant directly in 2–3 gallon containers. Light feeding is key — SS is sensitive to overfeeding. The 60–70 day seed-to-harvest timeline makes it one of the fastest autos available. Gentle LST can increase yields but isn't strictly necessary. The sour citrus terpenes benefit from a 3+ week cure.
Head-to-Head Comparison
This is the definitive Mephisto head-to-head — their two most popular strains offering completely different experiences from the same elite genetics program. Double Grape is the potency king: up to 31.8% THC, heavy indica effects, and a grape candy flavor that dominates the room. Sour Stomper is the daytime champion: zippy sativa-like effects, intense sour citrus flavor, and an even faster grow cycle. The growing experience is similar for both — Mephisto's breeding produces remarkably stable, easy-growing autos — but Double Grape gets bigger and yields more, while Sour Stomper stays compact enough for truly small spaces. Most MephHeads end up growing both, often in the same tent. They complement each other perfectly: Double Grape for evenings, Sour Stomper for mornings, and both ready to harvest within 10 weeks of planting the seeds.
Where to Buy Double Grape & Sour Stomper Seeds
These are the seed banks we recommend based on breeder selection, reliability, and community trust. Affiliate links support this site at no extra cost to you.
North Atlantic Seed Co (NASC)
Reddit #1Largest selection from 300+ breeders — the community #1 pick on Reddit
Multiverse Beans
PartnerPremium genetics with insane freebies — use code MULTIVERSE420 at checkout
Frequently Asked Questions
The Verdict
you want maximum auto potency, grape candy flavor, and a heavier evening high — Double Grape is one of the strongest autoflowers ever tested
you want a daytime auto with energizing effects, intense sour citrus flavor, and a super-fast 60-day grow cycle in a tiny space