Nearly all my seedlings are started inside under lights, then moved to a cold frame then finally they will find there way out into the garden.

I am doing vinca and coleus also this year.
The vinca were the Cora Cascades, Mediterranean mix and Pacifica Mix.
I do have a few regular Impatiens sprouted.
I'll keep the New Guinea sowing and see if they sprout.
I think that I may have a few begonias sprouting---needs a magnifying glass to see them.
They were mostly older seeds and I know older seeds sometimes are slow to sprout.

I pour boiling water over the soil, let cool then plant. Seems to slow the growth.

also have to make sure the soil is moist enough not to catch fire .. dry peat can burn easy