In this video, Patti the Garden Girl will show you how to put drainage holes in your container garden from galvanized steel containers. To avoid your plants sitting in water, you simply need a hammer and a nail that is about a quarter of an inch thick. You then should hammer about 10 small holes in the bottom of your galvanized steel planter. This should allow proper water circulation in your planter, preventing your plants from drowning. This is a perfect and easy way for any gardener who would like to use galvanized steel containers to add drainage holes to their planters.