Planning For The Stretch
Stretch on an auto starts around day twenty and can double or triple the plant before it stops in week five, so the height you see at day eighteen is not the height you get. I hang the light for the finished size, not the seedling, and use a dimmer early rather than moving the fixture every few days. Typical stretch multipliers for popular autoflower seeds are listed at https://turboautoflowerseeds.com, and sativa leaning lines are wilder than their descriptions admit. Headroom runs out fast in a short tent.