If you have a rolling cart, you could roll them outside on warm days (as long as there is not too much wind) and then roll them back in when it gets cold.

About pots: some nurseries will recycle old 4" plastic pots and flats and give them to you for free.

Recheck the FAQ's on the wintersowing forum. Not to late to WS the seeds you've listed. As a matter of fact I'm in zone 5 and the seeds you've listed, I'm going to be sowing this week and next.

As long as your containers are at least 3 inches deep, though deeper would be better, you can use any recyle type container as well as platic cups and styrofoam cups as well. They will hold up fine and you can use them again next year as well.

Fran

I use even 2 liter bottles cut in 1/2 and put cellophane overthe top with holes drilles in the bottom and poked in the cellophane! Just use a rubberband to hole the cellophane on! You can also use:

ANY container you can put holes in the bottom!!!!

Just put cellophane, as described above as the tops!

You can still sow the coneflowers for sure! OUTSIDE-
As far as the others..not sure!

I start mine on top of the fridge, cause of curious children running around, and great heat source, be sure to put some clear platic over them to hold in moisture. Remove the plastic after they come up, then plce in a window, and if ya can, under grow lights. After weather alows, move em outside.
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