Which phacelia are you seeding?
Phacelia campanula (Californai Bluebells) and phacelia tanecetifolia (mauve flowers on lacy foliage)
are good as direct sow also.
I have only a few seeds of other phacelia which i will do as WS.
I would like to get seeds for the large flowered variety of the campanula one, but so far have not found any.