As long as they are NOT clear cups you can do the whole seedling cycle in those. Your plant started from a seed is considered a seedling until you have 4 sets of true leafs and the 5th set is starting to form.

At that point you transplant them and start the vegetation cycle.
Zandor Reviewed by Zandor on . how long can u use plastic cups im using 6 medium cups from burger king ,just wanna know how long they can stay in the cups before i have to change. Rating: 5