I usually plant them in keg cups after the tap root is about 1/4" long. I put them under the soil about 1/2" or so. Before I put the seed in the soil I measure out 1oz of distilled water (a shot glass full) and pour it in the middle of the keg cup. Then i use tweezers to make the 1/2" hole and put the seed taproot down in the soil. The next watering I do is after the seeds have broken the soil. I continue to only give them 1oz of distilled water (usually every other day, but watch to make sure the soil doesn't dry out) until they have formed their first 2 leaves, then I start stepping up how much water they get.