Flowering

The four sub-phases of flower, the crop-steering logic that governs each, and why the calendar is a guide rather than a boss.

The photoperiod trigger, why 12 h is safe but not sacred, and the light-leak myth put to rest.

Height control through a light ramp and generative steering, so the canopy fills the room instead of the lights.

Swing vegetative, ramp to peak light and feed, add CO₂ if you have it, and fatten the flower without inviting rot.

The two-touch schedule — day ~21 and day ~42 — plus the honest read on schwazzing.

Senescence steering — drop temps, widen day–night ΔT, raise VPD, cut RH — to load resin and protect terpenes.

The most-cited controlled trial found no yield, potency, terpene, or mineral difference across flush durations — and tasters preferred the unflushed flower.

Trichome heads are the primary cue — 80–90% cloudy plus 5–15% amber is peak THC. Pistils and calyxes only corroborate.

One reference table for the whole phase — phase, height, PPFD, temps, RH/VPD, and the action for each week.

The biochemistry of a controlled finish — why a managed decline concentrates resin and color, how to read the nutrient drawdown, and how to hold ripening in a narrow window instead of letting it run away.

Terpenes are volatile and heat-fragile — where they peak, how late-flower heat and light quietly bleed them off, and the environmental band that carries aroma from the plant into the jar.

Why 'density' is dry-matter packing, not a magic additive — the light, K, airflow, VPD and generative-steering levers that make flower firm, and the honest limit genetics puts on all of them.

A field guide to the failures that show up only in weeks 6–9 — foxtailing, late nute burn, premature or stalled fade, calyx-vs-trichome mismatch, and the bud-rot emergency — with the steering fix for each.