This Survival Podcast teaches how to water seedings from the bottom up. After you have transfered your plants to new pots, preferably sterilized bins, you put holes in the bottom of the pots. If they are too high, the watering technique will not work. The plants in the pot are placed into a larger bucket. You just add water to the outter bin and allow the plants to "draw up" the moisture through the soil. You want to make sure not to add too much water or the plants will "over-draw". About one quarter inch to one half inch is suggested. The best part of having them in a bin like this is that they are quickly and easily portable.