another good way is buy some organic jiffy peat pots which are the same shape as the cups but allow the roots to grow straight through them & can be placed straight into a larger pot with out any damage at all. I've also used some little foam like blocks i forget the brand name. but they are full of nutrients for seedlings & u just slide seed into the slit in the top keep it humid & moist then the seedlings grow out of that which again can be transplanted straight into a larger pot when the roots start breaking through.