C4 Auto
Sweet, buttery autoflower ready in just 9 weeks
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Use code HGAPP at Fast Buds checkout for 15% off.
From about €9 — see current US pricing at Fast Buds.
15% off with code HGAPP · US store with fast domestic shipping · Discreet packaging
Rated 4.9/5 by 47 verified Fast Buds customers
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Our take
C4 Auto is a slightly sativa-leaning autoflower (55% sativa / 45% indica) that reaches up to 20% THC and finishes from seed in just 9 weeks — no light-schedule changes needed. Its standout flavor profile blends sweet, buttery, and earthy notes in a way that's hard to forget. A forgiving grow that suits beginners and rewards experienced growers with heavy harvests.
Grow specs
Specs are Fast Buds's published figures for this product; catalog and pricing last verified August 2026. Our write-up is our own — see how we make money.
Growing notes
C4 Auto stays manageable at 28–39 inches tall despite its XL classification, making it a good fit for grow tents and outdoor garden beds alike. Because it flowers automatically, no light-schedule flip is required. The 9-week total cycle is genuinely fast. It adapts well to indoor, outdoor, greenhouse, and mixlight setups, giving growers in most US climates a realistic path to a solid harvest.
New to growing? Start with the complete guide, plan your gear with tent setups, and diagnose problems with troubleshoot.
Want variety instead?
Mix packs bundle three proven strains (30 seeds) at up to 50% off buying separately — the best value in the catalog.
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