Beginner Gardening: Planter with Reservoir System, 1 by MonkeyFlower

MonkeyFlower wrote:
Hi, can anyone help me please? I've just bought a balcony planter like the one in the picture, and when I got home I noticed that the drainage hole at the bottom is a spout 2 inches long, which means that when I water the plant, not all the water will drain out of the bottom. I've tried googling and it seems that this feature is some sort of water reservoir system? Can anyone please explain how this works please? Because I don't want to end up with rotting roots, especially since I intend to planting portulaca in it, and succulents don't require a lot of water. I'm used to watering until water seeps out of the bottom of the pot. I'm thinking of taking the pot back. :( Thanks a lot.