Why Aren't My Seeds Germinating? Common Causes & Fixes

You sowed your seeds, watered them, waited… and nothing. It is the single most common frustration for new gardeners — and the good news is that it is almost always one of a handful of fixable causes. This guide explains why seeds fail to germinate, how to fix each problem, and how to test your seed before you sow.

Quick diagnosis

Match what you are seeing to the most likely cause, then read the fix below.

• Nothing at all too cold, too deep, or old seed
• Patchy & uneven dry spots or uneven warmth
• Up then collapsed damping off — too wet
• Mouldy surface overwatering, poor airflow

First: how long should germination take?

Before you give up, check the calendar. Most seeds sprout in anywhere from a few days to three weeks, and slow growers such as parsley, peppers and lavender can take longer still. Always check the germination time printed on your packet, and make sure you are sowing in the right season — our sowing calendars for vegetables, flowers, herbs and fruit show exactly when to sow what.

The most common reasons seeds do not germinate

• It is too cold. Most seeds need 18–22°C to get going. A cold windowsill or unheated room stalls them — move somewhere warmer or use a propagator.
• You sowed too deep. Cover a seed only as deep as it is wide. Many small seeds (lettuce, basil, snapdragons) need light and should barely be covered at all.
• The compost dried out. Even a single dry day can stop germination for good. Keep the surface evenly moist and cover with a clear lid or bag until seedlings appear.
• It is too wet. Waterlogged compost starves seeds of air and rots them. Aim for moist, not soggy, and always use pots with drainage.
• The seed is old or was badly stored. Viability falls over time, faster in warm, damp conditions. Test old seed (below) and keep the rest somewhere cool, dark and dry — see storing & saving seeds.
• You sowed at the wrong time. Sowing too early or too late means the temperature and light are wrong. Follow a sowing calendar.
• Light-needing seeds were buried. Some seeds need light to germinate — surface-sow them and press gently into the compost rather than covering.
• The seed needed pre-treatment. A few types (sweet peas, some perennials) come up faster after soaking overnight or a spell of cold. The packet will say if so.

A simple germination checklist

1. Warmth 18–22°C
2. Depth seed-width only
3. Moisture damp, not wet
4. Light once they show
5. Patience check packet time
6. Label note the date

How to speed up germination

A few simple tricks get more seeds up, faster:

• Give bottom heat — a propagator or heat mat keeps the compost at the 18–22°C most seeds love.
• Cover to trap humidity — a clear lid or a freezer bag stops the surface drying out.
• Pre-soak large or hard-coated seeds — an overnight soak softens the coat of peas, beans, sweet peas and beetroot.
• Use fresh seed compost — fine, low-nutrient and free-draining beats garden soil or old, lumpy mixes.
• Sow in season — the right warmth and light beat any gadget; check a sowing calendar.

Test old seeds before you sow

Not sure if last year's seed is still good? A quick paper-towel test saves you weeks of waiting:

1. Dampen a sheet of kitchen paper and lay 10 seeds on it.
2. Fold it over, slip it into a labelled bag, and keep it somewhere warm.
3. Check after the germination time on the packet.
4. Count the sprouts: 8 of 10 means great seed; 4 or 5 means sow more thickly; 1 or none means replace it.

More on keeping seed viable in our guide to storing and saving seeds.

Still nothing? Try this

If a fresh, well-timed sowing still fails, rebuild your confidence with fast, foolproof varieties — radish, sunflowers, beans and salad leaves rarely disappoint. Start them somewhere warm and bright, and follow our guide to starting seeds indoors for the best possible start.

Ready to try again? Browse fresh seeds.