Why Your Seedlings Stopped Growing (6 Checks)
Seedlings stop growing for 6 reasons. Run through these checks in order to find the cause.
The 6 Checks
Check 1: Root Space
Sign: Roots circling the pot bottom. Fix: Transplant to a larger pot.
Check 2: Nutrients
Sign: Plant grew 2-3 weeks, then stopped. Fix: Fertilize at 1/4 strength.
Check 3: Light
Sign: Plant leans, pale. Fix: Move or add a grow light.
Check 4: Temperature
Sign: Sudden change in location. Fix: Move back to 65-70°F.
Check 5: Water
Sign: Soil always wet OR always dry. Fix: Adjust watering.
Check 6: Pot Size
Sign: Roots bound in circle. Fix: Transplant.
The Diagnosis Flow
- How long has it been stalled? Less than 3 days → wait.
- Do roots circle the pot? → Transplant.
- Is soil always wet or always dry? → Fix watering.
- Is light less than 6 hours? → Move.
- Has it been 2-3 weeks since sprouting? → Fertilize.
Common Questions
How fast should seedlings grow? Most double in size every 5-7 days.
Is it normal to stall? Brief stalls (2-3 days) are normal.
When do seedlings need fertilizer? 2-3 sets of true leaves.
Can a stalled seedling recover? Yes, if you fix the cause.
How big before transplanting? 3-6 inches with 2-4 sets of true leaves.
Why did they stop after transplanting? Transplant shock. Normal for 3-7 days.