when they are that small just give a little water. what i did was fill a cup with soil and saturate it. feel how heavy it is. now feel how heavy a cup of soil is with no water is. Now you can guage by feel when you need to water remembering the plant want to dry out between watering. you might not have to water for a week or more in the begining.as they mature and you have let them dry then saturate until water comes out the drain holes. it the cup or pot feels a little heavy or weighty dont water.