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!
