Flower Culture #3: drainage

Sometimes plants need drainage to do well. From what I understand, if you have a flat layer of clay below your plants then when you water them the water will collect down at the bottom and you plants won't do well. So (I think) the solution is to lay a pipe or lay rocks in the bottom of the bed and fluff up the soil. Make sure the rocks or pipes are inclined in the direction you want it to go.