The Flowering Stage, Week by Week

Weeks 1–3: the flip, the stretch, and first pistils

The day your timer goes to 12 hours on and 12 off, nothing visible happens — and that is normal. The plant first has to read the longer nights and change its hormones, which takes most of week 1. What you will see is the plant doing the opposite of settling down: it stretches. Internodes lengthen, branches race upward, and the plant can add half its height again, sometimes more. This is the growth Guide 5 told you to leave headroom for.

Around the end of week 1 into week 2, look at the nodes — the joints where branches meet stems — for the first pistils: pairs of fine white hairs emerging from small teardrop-shaped calyxes. Those hairs are the unmistakable signature of a female in flower. Clusters of them at the branch tops are the first draft of your buds.

Your work in these weeks is support and space management. Keep raising or dimming the light to hold a steady distance as the canopy climbs, feed a transition blend — plants still use nitrogen while they stretch, so do not cut it to zero on flip day — and get support in place before branches need it. Check daily that no top has quietly grown into the light; stretch does not send warnings.

Weeks 3–6: buds stack, resin starts, and thirst peaks

Somewhere in week 3 the stretch eases and the plant's budget changes direction — from growing taller to building flowers. The pistil clusters at each node grow upward into each other, calyx stacking on calyx, and separate bud sites start reading as continuous colas along the branches. Tiny, glassy mushroom-shaped glands — trichomes — begin frosting the buds and nearby small leaves. That frost is where the cannabinoids and aroma compounds live, and it is why the tent starts to smell like a decision your neighbors may have opinions about. Confirm your carbon filter is earning its keep.

This is the plant's hungriest, thirstiest stretch of the whole grow. Pots dry faster than they did in veg; the wet-and-dry rhythm still rules, but expect to water more often. Feeding shifts toward the bloom pattern — relatively less nitrogen, more phosphorus and potassium — at steady, moderate strength. The leaves should stay green and working: a plant that yellows deeply in week 4 is usually underfed, overfed into lockout, or telling you its pH has drifted, in roughly that order of likelihood. Guide 10 unpacks all three.

Hands mostly off now. Resist heavy defoliation — leaves are the engines filling your buds — and limit yourself to removing the odd leaf that is sealing damp air against a bud or a stem. The weekly habit that pays is inspection: leaf undersides for pests, inner buds for anything fuzzy, and a slow look at the whole canopy from the door before you touch anything.

Weeks 6 to finish: swelling, ripening, and the fade

The final act is quieter and easier to misread. Upward growth is done. Buds now gain their real weight — not longer, but denser, as calyxes swell and pack tight. Pistils gradually darken from white to orange and rust tones and curl inward, though new white pistils can keep appearing on some strains, which is exactly why pistils alone cannot call harvest day.

Many plants also show a fade: large fan leaves yellowing and dropping as the plant pulls mobile nutrients out of them and into the buds. A gentle, bottom-up fade in the last two weeks is the plant finishing its life cycle on schedule. A fast, blotchy, mid-plant yellowing in week 6 is not a fade — it is a problem arriving early, and it deserves the same diagnosis as it would in week 4.

A note on dates: the flowering time on a seed listing is the breeder's count under their conditions, from the flip, for the faster plants in the batch. Treat it as the opening of a window, not an appointment. Your window is the next section's subject, and it is written on the buds themselves, in trichomes.

The flowering week-by-week table: see it, check it

Pin your grow to this table loosely — strains run a week fast or slow against it and that is fine. What the table really teaches is the order of events, and the order never changes.

Reading trichomes in plain words: clear, cloudy, amber

If the pistils are the plant's advertising, the trichomes are its paperwork. Under a jeweler's loupe or a cheap pocket microscope — 40x to 60x is plenty — the resin glands on the buds look like tiny mushrooms on stalks, and they change appearance as they mature in a way you can genuinely see.

Clear trichomes look like glass: the resin inside is not finished, the cannabinoids are still being built, and harvesting now costs you strength and weight no matter what the pistils say. Cloudy or milky trichomes look like frosted plastic: this is peak maturity for most growers, the classic harvest window, associated with the strain's fullest, most balanced effect. Amber trichomes have begun to age past that peak; as the share of amber grows, the effect is widely reported to lean heavier and more sedating, and total potency slowly declines.

How to use this in practice: check trichomes on the buds themselves, not the sugar leaves — leaf trichomes mature faster and will fool you into an early harvest. Sample a few spots, including a mid-plant bud, because tops ripen first. Most growers harvest somewhere in the mostly-cloudy zone with a sprinkling of amber — say up to about a fifth — adjusting earlier for an energetic result and later for a sleepier one. Two or three days either side of perfect changes little; two weeks early changes everything.

Males and hermies: how to spot them and what to do

A male plant's flowers look nothing like buds: they are clusters of smooth, round balls hanging at the nodes, with no white hairs. Left alone they open into small flowers that shed pollen, and pollen is a one-way trip — a pollinated female diverts her energy into making seeds, and every bud in the tent pays for it. With regular seeds, check every plant through the first two weeks of flower, and remove any male the day you are sure, bagging it before you carry it past the females so you do not shake loose pollen on the way out.

A hermie is a female that grows some male parts, usually as a stress response — light leaking into the dark period is the classic trigger, along with severe heat, drought, or rough handling — though some genetics are simply prone to it. The late-flower version is the little yellow 'banana' (a bare stamen) poking straight out of a bud. One or two bananas in the final weeks, on a plant nearly ready, is a small event: pick them off carefully with tweezers and carry on. Balls on stems early in flower, or bananas appearing everywhere and early, is a bigger one: that plant is a pollen source sitting inside your crop, and removing it is usually the honest call.

Prevention is mostly housekeeping: a genuinely dark dark-period, stable temperatures, steady watering, and genetics from breeders who test for it. Which is to say, the same boring basics as everything else in growing.

Humidity, airflow, and keeping bud rot out

The denser buds get, the more the air around them matters. A fat cola is a sponge with no circulation inside it, and the fungus growers call bud rot (botrytis) starts exactly there — inside the biggest, best buds, invisible until it has a head start. Its calling cards are a single small leaf dying into an otherwise healthy bud, and grey, dusty fuzz when you gently open that bud.

Defense is environmental, not chemical. Keep air moving through the canopy with your circulation fan so no pocket of air sits still and damp, and bring humidity down as flowering progresses — the low 40s to mid 50s percent in mid-to-late flower is the working range most indoor growers aim for, lower than veg (Guide 11 goes deep on the numbers). Keep buds from resting against tent walls where condensation collects, and give crowded branches a little space or support so air passes between colas.

If you do find rot, act the same day: remove the affected bud well below the visible damage, bag it inside the tent before moving it, and check its neighbors closely for a week. It feels brutal to cut away your best-looking bud. Leaving it costs the ones next to it.

Frequently asked questions

How long does the flowering stage last?
Most photoperiod strains finish in about 8 to 10 weeks from the flip to 12/12, with faster indica-leaning plants at the short end and sativa-leaning plants sometimes running 11 weeks or more. Autoflowers flower for roughly 6 to 8 weeks after their 3 to 5 week veg. The seed listing gives the breeder's estimate; your trichomes give the real date.

Why are my buds still small in week 5?
First check the honest causes in order: light intensity (small, airy buds are the signature of too little light), then whether the plant is actually only in week 5 by its own clock — the first week after the flip is transition, not full flower. Genetics set the ceiling, and some strains do most of their swelling in the final two weeks. Small but frosty and swelling is a plant on schedule.

Should I flush before harvest?
Growers argue this one endlessly. What is certain: starving a plant for its final two weeks does not help it finish, and plain-water finishes are a personal choice rather than a requirement. If you feed salts heavily, easing to plain water for the last few waterings is common practice; if you grow in living soil, there is nothing to flush. Either way, harvest timing and a slow dry matter far more.

Can I harvest the top buds first and leave the lower ones?
Yes — this is called a staggered or partial harvest and it works well when tops ripen ahead of shaded lower buds. Take the ripe colas, lower the light slightly or raise the remaining plant, and give the rest another week or so to finish. It is one of the quiet advantages of growing your own.

I found seeds forming in my buds. Is the crop ruined?
Not ruined, but it has been pollinated — by a male you missed, a hermie in the tent, or pollen that traveled in. The buds are still usable; the plant simply spent part of its budget on seeds, so expect somewhat lower yield and strength. Finish the grow, then hunt the pollen source before the next run, starting with light leaks.