Rule of thumb
Older seeds need more cushion.
When seed age or storage is uncertain, bump the buffer and lower your germination estimate for safer planning.
Best practice
Track real results each season.
Write down what actually sprouted so next year your sowing plan is based on your own seed lots, not guesswork.
Pepper-smart tip
Use this before buying trays.
Knowing your true seed count helps you size trays, heat mats, labels, and potting mix before sowing day begins.
Calculator
Learn how many seeds to (sow)
Enter your target plant count and expected germination rate to see how many seeds to start.
plants
%
%
cells
Recommended start
16
Seeds to sow
Start about 16 seeds to end up with 12 healthy seedlings at an 85% germination rate with a 10% safety buffer.
Expected seedlings
13.6
Extra seeds
4
Tray fill
67%