How Much Does a Heat Mat Speed Germination? My Organic Garden Update

The heat mat WORKS! Ridiculously well, so well in fact that I’m definitely buying a second one next year. I’ve had the batch 2 of my seedlings going since 3/20 – it’s now 10 days later and everything seems to be growing strong!

Organic Seedlings with Heat Mat

Here’s how long everything took to germinate in the new seed starter plugs with the heat mat vs. without a heat mat:

Type of Seed

Days to Germinate
without Heat Mat

# of Seeds that Sprouted without Heat Mat

Days to Germinate
with Heat Mat

# of Seeds to Germinate with Heat Mat

Corno di Toro

14 days

3

7 days

3/3

Green Pepper

18 days

1/9

7 days

8/9

Jalapeno Pepper

19 days

3/4

8 days

4/4

Orange Bell

20 days

1/4

7 days

4/4

Pepperoncini

14 days

3/12

7 days

9/12

Red Pepper,

17 days

7/9

7 days

9/9

Tomato, Tess’s

3 days

9/12

3 days

11/12

­

Seed Plugs with Heat Mat as of 3/30:

Seed Starter without Heat Mat as of 3/30:

Pepperoncini without Heat Mat as of 3/30:

Pepperoncini with Heat Mat as of 3/30:

You may notice that I also started some other stuff in the seed plugs including eggplant, broccoli, kale, and cabbage. Broccoli and kale don’t really need heat to germinate but it seemed to work for them!

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  1. [...] Land Currant Tomatoes that were planted about 4 weeks ago (there was supposed to be 12, check out my heat mat experiment to see how much better my 2nd batch germinated in it). These were planted about 2.5 weeks ago on a [...]

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