SYMPTOM | POOR GENETICS? | POOR ENVIRONMENT? |
Seed pops (taproot shows) but never opens above soil | Embryo weak, immature seed, old/bad storage | Planted too deep, soil crusted/dried on top, cold/wet soil rotted it |
Seedling emerges twisted, fused cotyledons, or no growth tip (“headless”) | Developmental defect in seed; line throws runts/mutants | Helmet head left on too long (low humidity), physical damage removing shell |
One or two out of a batch are tiny, slow, “runt” while sisters are normal (same treatment) | Genetic runt, low vigour phenotype | Uneven light or one pot badly overwatered/compacted |
Cotyledons never really green up, plant stays sickly from day 1 | Weak embryo, poor seed nutrition | Medium too hot/salty, pH way off, soaked medium killing roots |
True leaves deformed from first set (claw/wonky/uneven) and stay that way | Genetic deformity, bad allele expression | Light too close (heat), big temp swing, fan blasting seedling |
Whole plant permanently slow even after conditions improve | Low-vigour genetics | Stayed cold/wet early, became rootbound, never transplanted |
Several seeds from same pack show SAME weird deformity | Batch / line issue | Unlikely all growers did exact same mistake at same time |
Plant can’t support itself even though internodes are short (not stretched) | Structural weakness genetically | Overwatered constantly → weak stem; no airflow → weak stem |
Long, pale, stretchy seedling that falls over | — (genetics don’t do this to all seedlings at once) | Light too weak/too far, windowsill grow, too warm + low light |
Stem pinched at soil line, plant flops (“damping off”) | — | Overwatering / poor airflow / too cold / dirty medium |
Leaves yellowing early while cotyledons still green | — | Medium too wet → no oxygen → root stress; feeding too early/too strong |
Patchy nutrient issues on ALL plants | — | pH, feed, watering, temps — i.e. grower/system problem |
Patchy nutrient issues on ONE plant only (others fine) | Possible mutation affecting uptake | Local watering error, that pot stayed wet/cold |
Plant stalls right after transplant while others don’t | Possible weak individual | Transplant shock, root damage, dry pocket in soil |
Multiple plants from different breeders all stunt with you | Very unlikely all bad genetics | Your environment/watering/light is the problem |
Same pack: 3 good, 2 terrible, all treated identically | The 2 terrible ones = genetics | — |
Most early seedling problems come from two places:
Environment/growing conditions (too wet, too cold, not enough light, planted too deep), or
The seed itself (weak/old seed, genetic deformity).
If you follow the “Seedling Success Guide” we sent you (correct pot, airy mix, shallow planting, gentle moisture, 18/6 light, warm room, light airflow), then early failure is much less likely to be your fault.
Seedling stretched tall and fell over → light was too weak/too far (windowsill, cloudy room).
Stem went skinny and collapsed right at soil level → too much water / soil stayed wet / no airflow.
Seed didn’t make it through the surface → planted too deep or surface dried out.
Plant looked fine, then room got cold/drafty → cold stress.
These are fixable next run. We can tell you how.
Seed cracked and showed a root, but never opened proper leaves.
Seedling came up twisted, fused, or without a proper top while the others were normal.
In the same setup, 3–4 plants are great but 1 is a tiny runt that won’t grow.
More than one seed from the same pack had the same odd defect.
When we see that you’ve followed the guide and the problem looks like a weak embryo or deformity, we’ll look after you.
If you’re not sure, send us:
What pot you used,
What soil/mix you used,
Where it was sitting (window / grow light / outside),
How deep you planted it,
How often you watered in the first 3–4 days,
A photo.
With just that, we can usually tell you in one go if it was environment or seed.