Why Won't My Seeds Germinate Despite Regular Watering?

Why Won't My Seeds Germinate Despite Regular Watering?

You water, you wait — and nothing comes up. Watering is only one of the four conditions of germination: when seeds sulk, the problem is almost always elsewhere. Here is the diagnosis, from the most frequent causes to the most subtle.

Contents

• Cause 1 — soil too cold
• Cause 2 — regular watering that drowns
• Cause 3 — dead or dormant seeds
• Cause 4 — sown too deep
• Cause 5 — contaminated substrate or containers
• Cause 6 — you have not waited long enough
• Frequently asked questions

Cause 1 — soil too cold

This is the no. 1 cause of spring non-emergence. Below ~18 °C soil temperature, warmth-loving seeds rot in the ground instead of germinating — and in open ground, no seed emerges below 7 °C. Regular watering changes nothing: it even worsens the rot.

• In open ground: wait for the last frost and soil at least 7 °C.
• Indoors: a heat mat under the tray gains 8 to 11 °C above ambient — often the sufficient solution.
• Demanding species: pepper and aubergine do not germinate at all below 18 °C.

Cause 2 — regular watering that drowns

Proven paradox: too much water causes as many failures as too little. A constantly soggy substrate deprives the seed of oxygen — it breathes — and favours the fungi that rot it before it emerges. The test: squeeze a handful of soil; if it drips or stays a compact lump, you are overwatering.

Cause 3 — dead or dormant seeds

• Seeds too old: germination capacity declines with age — young seeds germinate better and faster. Do the 10-seed test on moist paper: if fewer than half respond, replace the batch.
• Dormancy: a living seed can stay unable to germinate for a few weeks to 2 years even under ideal conditions. Causes: impermeable coat (legumes), need for cold (stratification), chemical inhibitors to remove by soaking.

Cause 4 — sown too deep

The rule: 2 to 3 times the seed's diameter, no more. Buried too deep, seeds lack oxygen — a common problem that goes unnoticed. At the next sowing, lay large seeds barely covered.

Cause 5 — contaminated substrate or containers

Damping-off kills seeds before or just after emergence: they stay soft, rot, or emerge then collapse. Proven causes: sowing into cold damp soil, contaminated containers, substrate carrying pathogens — garden soil is the first suspect. Solution: sterile seed-starting mix + containers disinfected with bleach.

Cause 6 — you have not waited long enough

Emergence varies enormously by species: 2-4 days for radish, but 3 weeks for celery and a month for parsley — even under optimal conditions. If nothing has emerged a week after the normal delay stated on the packet, only then consider replacing the seeds.

Frequently asked questions

Why won't my seeds come up despite watering?

In order of likelihood: soil too cold (cause no. 1), paradoxical water excess, dead or dormant seeds, sowing too deep, contaminated substrate — or the normal delay has not yet elapsed.

How to know if my seeds are still alive?

The 10-seed test on moist absorbent paper in a bag, kept warm: more than 7 emerging = good batch; 5-7 = sow thicker; under 5 = replace.

Should I let it dry between waterings?

Not during emergence — the surface must never dry. But never dry does not mean soggy: the target is a wrung-out sponge, not mud.

A good germination tray combined with a heat mat eliminates causes no. 1 and no. 2: stable warmth and controlled moisture.

Want your home sowings to succeed? Germie's reusable germination kits get your seeds started in record time — and the Gardiscan analyses your soil for a perfectly calibrated start.