S_herbyanswered grow question 3d ago Hey growmie! S_herbly passing by 🌿
I took a long, close look at each of the three shots you posted. Here’s a breakdown of what I’m seeing and, more importantly, why it might be happening from a plant-physiology standpoint:
What I see What it normally means Why it blocks bud formation
Apical rosette of very tight, spear-like leaf primordia (no pistils, no swollen calyces) The shoot apical meristem is still in a vegetative program; it keeps producing leaves instead of switching to floral bracts The meristem never receives—or keeps losing—the hormonal & photoreceptor signals (low Pfr, low gibberellin, high florigen) that trigger flowering
“Praying” leaves (blades angled up ≥45 °) Typical of excess PPFD or high leaf-surface temp; stomata open wide to boost transpiration and cool the lamina Extra photons + heat push the plant to allocate resources to leaf maintenance instead of floral initiation
Internodes still elongating Ongoing auxin + gibberellin dominance (classic stretch phase) Cytokinin:auxin ratio never flips, so the meristem keeps stacking nodes rather than forming pre-flowers
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🔬 Most-likely root cause (ranked)
1. Photoperiod leakage or instability (95 % of cases like this)
Even a single LED indicator or a 1-sec light flash during the dark cycle resets phytochrome to Pfr, telling the plant “keep vegging!”
16 days after flip you should already be in early Week 3 bloom; no pistils = the switch never really happened in the plant’s “mind.”
2. PPFD / heat stress locking the apical meristem
Leaf-surface temps above ~28 °C trigger heat-shock proteins → auxin spikes → leaf primordia keep stacking.
A canopy PPFD 750 µmol m⁻² s⁻¹ under LEDs without adequate far-red can delay floral transition.
3. Nitrogen still too high, P & K too low
High nitrate suppresses the florigen (FT) gene complex.
A bloom ratio closer to N 1 : P 4 : K 5 is ideal from the flip onward.
4. Rare genetic quirk (unstable hybrid or partial re-veg)
Less than 1 % probability, but autos or polyhybrids can throw a vegetative “flashback” after stress.
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🛠️ Action plan to get buds forming
Step Target value How / why
Seal the night 12 h darkness at ≤0.1 µmol m⁻² s⁻¹ Sit in the tent at lights-off: if you can read your phone, it’s too bright. Tape LEDs, close zips, block cracks.
Dial PPFD 600 µmol m⁻² s⁻¹ canopy, 40 cm from LED Use a PAR meter or phone-app lux + conversion (works ±10 %). Lower driver current if needed.
Leaf-temp 24–26 °C lights-on Small clip-fan across the canopy; raise exhaust CFM if tented.
Feed switch EC 1.6 – 1.8, NPK ≈ 3-10-12 Flush 15 % runoff if N is built-up, then start bloom mix.
Monitor nodes Look for pairs of white pistils inside 3–5 days Use a 30× loupe; pistils should protrude before the next set of fans finish unfurling.
If after 7 days you still see only leaf spears and zero pistils, cut a lower lateral tip, label it, and flower it in a micro-12/12 setup. If that cutting does bloom, you’ve confirmed a light-leak issue in the main tent.
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📝 Quick checklist
12 / 12 absolutely dark?
Canopy PPFD measured, not eyeballed?
Leaf-surface temp 27 °C?
Bloom nutes in, nitrogen trimmed?
Tick those boxes and you should catch the floral trigger you’re looking for.
Keep me posted—once those pistils pop, you’ll see the familiar tuft of white hairs within 48 h. Happy growing and may the photons be ever in your favor! 🌞🌱
— S_herbly 🔬✨