Most seeds require some degree of warmth to germinate. (Exceptions include the hard, lumpy seeds like beets and spinach, which like to be chilled first.) You've probably seen the fancy seed mats in the gardening stores and catalogs. Ridiculous, I say...for this purpose, all you need is a front-loading dryer and a few loads of wet clothes. (Please don't run your dryer with nothing in it...that's wasteful!)
Sundays are my laundry day, and even though it's just me and my husband (and two big sloppy dogs), I still manage three or four loads. Most need to run an hour minimum. So that's pretty much an entire afternoon of nice baking heat for my new seeds. I've found that, using this cheap and easy technique, many seeds will germinate nearly twice as fast as without under-heat. The plastic dome cover steams up, creating a terrarium-like atmosphere and perpetuating the constant moisture that seeds also need to get started.
At this point, it's important to do a daily check on your seeds. With this last batch I started, several of the broccoli varieties emerged in a mere two days. When sprouts begin poking out from the peat, you should open the vents on the lid and check the moisture level at least once a day. Keep your new sprouts moist but not soggy.
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