Flowering plant pushing new leafy growth instead of buds

Likely causes, most likely first

Ranked for this sign on its own. Your stage, medium and readings change the order, so run the checker for your plant.

1. PossibleLight leak or interrupted dark period

   LightAct within a day or twoRead: Photoperiod and light leaks: 18/6, 12/12 and the dark period

   Fix: Seal the dark period: pinholes, zips, vents and equipment LEDs (tape them), and check the timer. Even dim night light can delay flowering in sensitive cultivars and reveal herm-prone genetics. Use a green headlamp only for brief checks.

   Recovery: Flowering resumes within 1-2 weeks; no new single-blade leaves.

   How to confirm it

   • Check for light leaks in the dark period. Sit inside the tent or room for 5 minutes after lights-off until your eyes adjust. Look for pinholes, zips, vents, indicator LEDs on equipment and light under doors. Also confirm the timer actually switches off and stays off.

2. PossibleRe-vegetation from too-long days in flower

   LightDeal with it this weekRead: How do I reveg a plant after harvest?

   Fix: Restore an uninterrupted 12-13 h dark period (13/11 is fine; some cultivars flower at 14-15 h days with ramps). Outdoors, early-season plants under long days re-veg; plant later or use light deprivation.

   Recovery: No new single-blade growth within 2 weeks.

   How to confirm it

   • Check for light leaks in the dark period. Sit inside the tent or room for 5 minutes after lights-off until your eyes adjust. Look for pinholes, zips, vents, indicator LEDs on equipment and light under doors. Also confirm the timer actually switches off and stays off.

Look for

Leafy shoots with single-blade leaves out of bud sites; photo of the dark tent..