Q: I bought a half-barrel to use as a planter. It does not have drainage holes. Besides the regular watering I do for the plants, we have had more rain than usual. Now the barrel is at least half full of water. The plants are starting to drown. I don’t want to drill holes in the bottom. Can I just add some gravel to the bottom for drainage? I didn’t add gravel in the first place because it would make the barrel too heavy. I did think that the plants don’t need a whole barrel of expensive potting soil and the gravel is cheaper….