I have a tall planter and when I first used it I found it hard to keep the lower plants watered enough to keep them going so I drilled holes in a 2" PVC pipe and placed it in the container before adding my soil and plants and this helps tremendously. I now have sedums in my planter so I don't worry so much about having enough water. But I'm not an expert on these planters either. On my smaller planters I usually soak them in a tub every once in awhile. These are the ones with herbs or violets or whatever.