It's important to read the seed label before purchasing. Inert material is something you'll see on the tag; here's why you should avoid it.

weed seed, inert matter, and germination. A seed test will give the required values. Testing saved seed will give the person using the seed a good understanding of the germination potential of his ...

A woman chooses a packet of seeds from the selection hanging on the shelves in a garden center. - Juan Reig Peiro/Getty Images ...