Description
Product Overview
Chem 91 F4 by CSI Humboldt is a legendary preservation masterpiece engineered for true connoisseurs of pure, old-school industrial funk. This premium regular photoperiod strain produces highly resinous, bright green flowers that deliver an intensely pungent, eye-watering aroma of raw chemical diesel, acrid fuel, and sharp skunk gas. Revered for its deep historical significance and hard-hitting potency, Chem 91 F4 is an essential acquisition for serious growers and breeders looking to access an unadulterated, clone-authentic West Coast genetic foundation.
Genetics & Lineage
- Breeder: CSI Humboldt
- Lineage: Pure Chem 91 Selection (Skunk Va Clone-Only Lineage)
- Genotype: Regular Photoperiod (50/50 Male/Female Ratio)
Cultivation Specifications
Light Requirements: Requires standard photoperiod light cycles (18/6 for vegetative growth, flipped to a strict 12/12 cycle to induce bloom). It responds remarkably well to standard HPS or modern full-spectrum LED systems, showing a strong vertical stretch post-flip.
Nutrient Profile: Moderate feeder but highly sensitive to over-watering and excessive Nitrogen in early flower. It leans toward old-school organic soil setups and gentle liquid lines to bring out the cleanest, loudest industrial-fuel flavors.
Environment: Prefers a classic, dry indoor climate with intense ventilation. Keep relative humidity (RH) strictly under 45% during the final 4 weeks of bloom. Air exchange must be high to mirror the breezy coastal California climate it was originally preserved in.
🧬 Choosing Your Pack Size
5-Pack — The Pheno-Taster: Ideal for hobbyists and small spaces.
10-Pack — The Hunter’s Choice: Best for pheno-hunting with built-in bulk savings.
20-Pack — The Vault Master: Designed for commercial projects and breeding.
Shipping & Guarantee
All seeds are shipped in crush-proof, discreet packaging. We provide a replacement guarantee on all genetics to ensure your garden starts with total confidence.
Disclaimer: These seeds are sold strictly as novelty souvenirs for genetic preservation purposes only.
Ronniemhoney8 –
grabbed some Chem 91 and a couple of autos last weekend. Really happy they made it all the way to Australia safely. Seeds arrived looking good and were packed properly. Chem 91 is the one I’m most excited about. Haven’t grown them yet, so I can’t judge the final results, but so far everything looks promising. Now just hoping to see what they turn into