I buy them from a local stamp dealer. I use the rather small ones, about 3" across. You want the UNGUMMED ones as the seeds will stick in the gummed ones. After putting the seed in them, I fold the envelope so that the seed can't escape and then put the folded envelope in a coin envelope. after taking all the trouble to make these crosses, I don't want to lose these seeds!
I store the cleaned seed in the crisper area of my fridge in a sealed plastic storage bag until planting in spring.
Kevin
