I use a soldering gun to make 18 holes around the cup and 1 thru the center of the bottom.
I tie the knot in the wool and pull it thru the hole with my wifes crochet hook.
Then I fill it with soil, place it in a canning jar, and gently water it until the jar gets about half full.
Then I mark the jar and let it sit over night, change the reservoirs to clean water, and plant.
I have tried various patterns of holes. So far this works best.
6 equal holes around the bottom, then 2 more layers of 6 holes going up.
I may try more holes on my next ones.