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what NOT to start on a heat mat?

Posted by michelelc 6A (My Page) on
Mon, Feb 28, 11 at 10:35


I started my broccoli and cabbage seeds on a heat mat last Wed. I went away for the weekend, and nothing had popped up before I left on Friday. This morning when I checked, everything had come up, but the broccoli had really gotten very leggy already. I'm starting a new batch of broccoli today. Should I NOT use the heat mat? Are their certain vegetables that don't like heat when germinating?

Follow-Up Postings:

RE: what NOT to start on a heat mat?

Cold weather crops like your broccoli and cabbage dont really like heat mats : )

Rule of Thumb: if it can take some frost or you plant it out earlier then tomatoes, it doesn't need heat.


RE: what NOT to start on a heat mat?

I started mine on a mat but watched them very closely. They were breaking through in 36 to 48 hours, at that point i took them off the heat and placed under lights.

This is my first year using heat so I know little about it, but all is well so far. My Royal Hillbilly Tomatoes did not come up but all others did. I expect bad seed.

RE: what NOT to start on a heat mat?

Most mats are controlled at 70 degrees and the temperature is not the problem, the time is. Gardeners read the packet which says germination should take up to 21 days, and are not prepared for many seeds starting in 3 days, when they should be taken off the heat. Al

RE: what NOT to start on a heat mat?

Thanks for all the advice. Maybe I'll pop the broccoli and cauliflower on the heat mat briefly and keep a close watch on them.

RE: what NOT to start on a heat mat?

Yep, the heat should be turned off as soon as germination takes place.

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