Garden Troubleshooting: Poor Germination

Why didn't my seeds come up?

Seed needs the right mix of moisture, warmth, oxygen and, for a few kinds, light. If any one of those is off, seeds may sit, rot or sprout unevenly. Old seed, soil that was too cold or too wet, planting too deep and surface crusting are the most common culprits.

Before you blame the seed company, dig gently where you planted and look. Seeds that are swollen but not sprouting, soft and rotten, or untouched and dry each tell a different story.

Keep track of what you did. Note the planting date, the depth, the weather over the next week and the seed lot. If one crop failed and others in the same bed did well, the cause is likely specific to that seed or that crop's needs. If everything failed, think about the bed itself, such as temperature, drainage or crusting.

• Dry, unchanged seed: too little moisture
• Mushy or moldy seed: too wet or too cold
• Sprouted but not emerged: crust or planting too deep

Is the soil too cold or too wet?

Different crops germinate best at different soil temperatures, and planting warm-season crops into cold soil is a leading cause of failure. Peas and spinach tolerate cool ground, while beans, squash and corn want warmer soil. A soil thermometer is inexpensive and takes the guesswork out, and your extension office can tell you the suitable range for each crop.

Cold, soggy soil also encourages rot that kills seeds and seedlings before they emerge. If beds are waterlogged in spring, wait, or build raised beds so they warm and drain earlier.

Starting seed indoors adds more variables. Warm, evenly moist seed-starting mix and good light after sprouting matter, and old or reused trays can carry disease that causes damping off, where seedlings collapse at the soil line. Clean trays between uses and avoid keeping the mix soggy. Ask your extension office for tested seed-starting guidance.

• Use soil temperature, not just air temperature, as your guide
• Wait a week if rain is in the forecast
• Raised beds warm sooner in spring

Could the seed itself be the problem?

Seed loses vigor with age, and heat and humidity during storage speed that up. Onion, parsnip and some other seeds are known for short shelf lives. Seed stored in a hot garage or damp shed may be weak even if the packet is only a year or two old.

Run a simple germination test before planting a large area: place ten seeds between damp paper towels in a bag, keep them warm, and count how many sprout. If fewer than expected germinate, sow thicker or buy fresh seed.

• Store seed cool, dry and sealed
• Check the packed-for year on the packet
• Test old seed on a damp towel first

How deep should I plant, and does depth matter?

It matters a lot. Tiny seeds planted deep run out of energy before reaching the surface, and large seeds planted too shallow dry out or get eaten. Packets usually list a depth, and a common rule of thumb ties depth to seed size, but follow the packet for your crop.

Firm the soil lightly over the seed so it touches the soil on all sides. Loose, fluffy soil leaves air pockets that dry out the seed.

Some seeds have special needs. A few need light to sprout and should be barely covered, and others, like some herbs and flowers, are slow and may take weeks. Check the packet and your local extension notes before deciding a crop has failed. Giving slow crops another week or two often saves you a needless reseeding.

• Follow packet depth for each crop
• Firm soil gently after sowing
• Mark rows so you know where you planted

Why does the soil surface harden and block seedlings?

Heavy rain on bare soil can form a hard crust that small seedlings cannot push through. Beets, carrots and lettuce are especially vulnerable. You can prevent crusting with a thin covering of fine compost over the row, or by keeping the surface evenly moist with gentle watering.

If a crust forms before emergence, break it carefully with a light tool or mist it to soften it, without disturbing the seeds below.

• Cover rows with a light layer of fine compost
• Water gently, not with a hard spray
• Use a board or burlap to hold moisture until sprouts appear, then remove it

Pests, birds and what to do next?

Birds, rodents and soil insects may eat seed or snip seedlings. Look for scratched soil, missing seed and chewed stems. Floating row cover or a mesh barrier protects new rows during the first weeks.

If the seed failed, check the days to maturity against your remaining season and your frost dates before reseeding. Keep notes on soil temperature, depth and seed source to avoid the same problem next time.

Mixed results are normal. Even well-handled seed does not sprout perfectly, so plan to sow a little thicker and thin to spacing once plants are established. Keep a few extra seeds in reserve for gaps, and reseed promptly while the season still allows a good harvest.

Last reviewed: November 12, 2026. Written by the Homestead & Small Farm Editorial Team. See our editorial policy.