Understanding Seed Germination Rates

Not all seeds are created equal when it comes to germination. Some seeds, like cress, zinnias, sunflowers, and marigolds, are incredibly easy to germinate. Simply toss them into moist soil, and they’ll sprout quickly. However, other seeds, particularly some fancy flowers or tricky perennials, can be more challenging to start

What is Germination Rate?

The germination rate indicated on the seed package represents the percentage of seeds likely to germinate. This rate is determined through tests conducted by seed producers. Typically, these rates are specified on professional seed packaging, and we take them into account when processing your orders. As a result, based on these rates, you may receive a package labeled "20 seeds," but it might actually contain 25 or 30 seeds.

For example, if a zinnia seed package indicates a “98% germination rate,” it means that out of 100 seeds, 98 are likely to germinate under ideal conditions. To simplify this calculation, you can consider a sample of 10 seeds, where approximately 9–10 seeds are expected to germinate.

How to Test Germination Rates Yourself

If you’re having trouble germinating seeds or want to check the viability of your seed packet, testing the germination rate is easy and doesn’t require soil.

Steps to Test Germination:

1. Prepare a Paper Towel: Take a paper towel and place some seeds on it.
2. Moisten the Paper Towel: Dampen the towel slightly (it should be moist but not soaking wet).
3. Seal in a Plastic Bag: Place the towel in a plastic bag to retain moisture.
4. Store in a Warm Place: Keep the bag in a warm area, such as on top of a fridge.
5. Monitor Daily: Check the seeds every couple of days to see if they’ve sprouted.
6. Calculate Germination Rate: After a week or so, count how many seeds germinated. Divide this number by the total seeds tested, and multiply by 100 to get the germination percentage.

Why Test Germination Rates?

Testing germination rates helps you determine the viability of your seeds, especially for varieties known to have lower germination rates, such as Rudbeckias like ‘Sahara’ or ‘Chim-Chiminee,’ Jerusalem Sage (Phlomis tuberosa), and Bugbane (Cimicifuga). This simple test can save you time and effort in the garden by ensuring you’re planting viable seeds.

Shop high-quality seeds with confidence from our store, complete with accurate germination rates and tips for success!