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Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minuteSeeds usually fail to sprout because they are not viable, or because moisture, temperature, planting depth, air, light, or dormancy conditions do not suit that crop. Start by identifying whether nothing emerged, only some seeds emerged, or seedlings appeared and then collapsed. That distinction points you toward the right fix instead of a one-size-fits-all remedy.
First, identify what kind of failure you have
Note whether no seedlings appeared, only some did, or seedlings emerged and later died. If several varieties in one tray fail, inspect conditions they share—such as watering, temperature, medium, and sowing depth. If one variety fails while others in the same tray grow, that points more toward seed viability or a requirement specific to that crop, though it does not prove either cause. The University of Minnesota Extension’s troubleshooting guide, updated in 2026, also flags salts in some potting mixes as a possible germination problem: Troubleshooting seedling issues.
If seedlings came up but then fell over or collapsed at the soil line, treat that as a different problem from seeds that never sprouted. Damping-off and excessively wet conditions are possibilities; see the University of Illinois Extension’s seedling troubleshooting guide.
Check moisture and drainage
Seeds need to absorb water to begin germinating, but they also need oxygen. Keep the growing medium evenly moist rather than letting it dry out or become waterlogged. Drying after a seed has started taking up water can damage it; saturated medium can restrict oxygen and encourage rot.
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Use a loose, well-draining seed-starting medium. If the surface dries quickly, a clear cover or humidity dome can help hold moisture before seedlings emerge. Check the tray frequently and remove the cover once seedlings appear so air can circulate and the surface does not stay wet for too long. Iowa State Extension explains these indoor seed-starting issues in Addressing Issues with Starting Seeds Indoors.
Measure the medium temperature
Germination temperatures vary by species, so use the seed packet’s guidance rather than assuming room temperature is right. Measure the growing medium with a soil thermometer; room temperature alone may not tell you what the seed experiences. Iowa State gives 70–75°F as a broad optimum for many seeds in its indoor troubleshooting FAQ, but it is not a universal target: The seeds that I start indoors germinate poorly. Why?
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If the medium is below the crop’s recommended range, a seedling heat mat may help. Use one only when the measured temperature calls for it, and follow the manufacturer’s directions. Heating is not a cure for poor seed, incorrect depth, or waterlogged medium.
Check sowing depth, light, and dormancy needs
Seeds planted too deeply may lack the energy to reach the surface; some seeds also need light to germinate. Follow the packet first. As a general Iowa State guideline, sow fine or light-requiring seeds on the surface and press them gently into contact with the medium. Medium and large seeds can generally be covered with mix to a depth of one to two times the seed’s diameter.
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Some species require a particular light condition or a dormancy-breaking treatment, such as soaking or cold stratification. Do not apply pretreatments unless the packet or a reliable species-specific guide calls for them. For more on light and seed-starting conditions, see the University of Georgia Cooperative Extension’s Starting Plants From Seed for the Home Gardener.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Test seed viability before discarding a packet
Old, damaged, or poorly stored seed may have lost viability. A simple home test can help you decide whether a questionable lot is worth sowing: place a sample between moist paper towels, keep conditions appropriate for that species, and check it after 5–10 days. Count how many sprout. Penn State Extension describes this method in Seed and Seedling Biology. The test is a quick indication, not a universal pass-or-fail standard for every crop or planting purpose.
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For outdoor sowing, inspect soil and weather conditions
In a garden bed, compacted or crusted soil can interfere with air and water movement. Heavy rain may dislodge seeds, reduce air pockets, or encourage disease, and wildlife may eat seed before it emerges. These causes are more relevant outdoors than in a controlled indoor tray.
A soil test is not a default explanation for failed germination. The University of Maine Cooperative Extension notes that nutrient deficiencies generally affect later seedling growth more than germination, while compaction, crusting, excess moisture, pathogens, planting technique, and predation can all contribute: Will a soil test determine why my seeds did not germinate?
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Match the fix to the likely cause
- Medium too cool: Measure it and compare with the packet’s range; consider a heat mat only if needed.
- Medium drying unevenly: Water carefully and consider a temporary clear cover until emergence.
- Medium soggy or poorly aerated: Reduce excess water and use a loose, well-draining mix.
- Wrong depth or light conditions: Resow according to the crop’s packet directions.
- Uncertain seed viability: Test a sample or replace seed if the lot performs poorly.
- Possible salts or contaminated mix: Try an appropriate fresh mix or seek media testing. Minnesota Extension suggests submitting a sample to its soil lab when salts are suspected; that is a targeted step, not a routine test for every failed tray.
For a deeper look at why seeds sprout and how seedlings develop, see Penn State Extension’s Seed and Seedling Biology.
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