What medium should you use for your germ tests?

Here’s what we do. I know it’s not the only way to test each crop. But with these mediums we’re able to get reliable and consistent results.

So there are 3 mediums we use.

For this post I decided to focus on veg crops rather than flowers and herbs because they were the easiest to do without a lot of little footnotes.

Between Two Blotters

Crops: Onions, Leeks, Brassicas, Beets, Chard, Carrots, Radishes (I know, they are brassicas!), Squash, Melons, Watermelons

In Sand

We plant big seeds in sand. The sands provide some extra moisture without soaking the seeds. We buy sandbox sand from the local hardware store for these germ tests.

Crops: Beans, Peas, Corn

 On The Top Of  Blotter Paper

We test these seeds on top of a blotter paper. Light helps these crops germinate. (Especially when they are freshly harvested.)

Crops: Lettuce, Tomatoes, Peppers, Eggplant

And one other thing about germ tests – make sure to label them!! We label all germ tests with the Crop Code, the lot number, and the date we started the test. We label the blotter paper and we label the Petri dish lid for the test. Double labelling keeps big mistakes from happening!

Next workshop: Tuesday Dec 6 at 2pm Eastern

2 thoughts on “What medium should you use for your germ tests?

  1. Hi Dan,
    I’d love to know the source of the clear plastic trays you’re using for the germ tests – we’ve mostly put our towels in open ziploc bags, but those look nice. And thanks for sharing all this great information about both seed production and data tracking!

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