A packet may contain far more seeds than your garden needs. Start with the number of final planting spaces, then allow for imperfect germination. This keeps a small project from becoming dozens of extra pots that need care and somewhere to live.
Use a simple germination calculation
Divide the target plant count by germination expressed as a decimal, then round upward. Six plants at 85 percent germination gives 6 ÷ 0.85 = 7.06, so the calculator suggests eight seeds. The result is an estimate of sowing quantity, not a guarantee of eight usable seedlings.
Account for what the number leaves out
Germination and survival are different. Seedlings may be lost to drying, disease, handling, or outdoor conditions. If a crop is essential, a small reserve may be sensible. Avoid multiplying every crop by a large safety margin when you have limited space.
Tie quantities to the bed
Count mature planting positions using the variety’s spacing guidance. Six tomato plants and six lettuce plants require very different areas. For direct-sown crops, the desired final stand and thinning method also affect how you distribute seeds along a row.
- Use a recent packet germination figure when available.
- Record actual emergence for the next sowing.
- Share surplus plants before they outgrow their containers.
Open Quantities in the planner and enter your plant target and germination estimate. Review the suggested seed count alongside your actual bed capacity.
Plan my gardenOur guides offer general planning advice. Check the instructions for your seed variety and your local extension service before planting. We do not claim hands-on tests of products mentioned in buying guides.