I am planning on growing zinnias from seed, and starting them indoors using a heat mat. ( I know that many sources say it's even better to direct sow them, but I get too much competition from weeds and other self sowing annuals to do that) I have read the advice of other gardeners that say they remove the heat mat as soon as the zinnias germinate. But if zinnias like heat and warm soil, why wouldn't you let the heat mat on longer? I'm especially wondering about this because the room I'd be keeping them in is unheated, so it's quite cool in there.
Thanks for your input!

pinkruffles said:But if zinnias like heat and warm soil, why wouldn't you let the heat mat on longer? I'm especially wondering about this because the room I'd be keeping them in is unheated, so it's quite cool in there.

Hi PinkRuffles,

Since the room is unheated, leaving the heat mat on is a good idea. Don't get it too hot (if it is thermostatically controlled) and be aware that the warmth can dry out your pots faster, so watch that to water them as necessary.

ZM

pinkruffles said:I am planning on growing zinnias from seed, and starting them indoors using a heat mat. ( I know that many sources say it's even better to direct sow them, but I get too much competition from weeds and other self sowing annuals to do that) I have read the advice of other gardeners that say they remove the heat mat as soon as the zinnias germinate. But if zinnias like heat and warm soil, why wouldn't you let the heat mat on longer? I'm especially wondering about this because the room I'd be keeping them in is unheated, so it's quite cool in there.
Thanks for your input!

My basement gets down to 60F and I have no problem with zinnia (or any other flower seed) germination. Is my basement just unusually warm?

I find zinnias one of the easiest plants to start from seed on a heating pad with lights. But, as with all seeds started and continued in this manner, one has to be cautious, particularly when using available potting soils. They are composed of three/quarters peat moss. Your growing containers will dry out VERY RAPIDLY! Water often. Cheers!