- Galvanized tubs are typically used for livestock watering and feeding, and as such, they are designed to be leak proof. This can create an issue with drainage when using these tubs to grow food. It is necessary to drill several small holes in the bottom of the galvanized tub to allow excess water to drain out. In addition, a 1 inch layer of gravel or rock can be placed at the bottom of the tub to aid in the drainage process. A layer of gravel beneath the tub can aid in the drainage of water as well.
- When placed in direct sunlight, a galvanized tub will become hot and retain that heat for a few hours, even after the sun goes down. Because the metal tub holds heat, there can be problems with growing food in the container. To combat it, it is necessary to provide an insulating layer before the soil is placed in the tub. Bubble wrap can be placed around the sides and the bottom on the inside of the tub to create a heat barrier. Include holes in the bubble wrap on the bottom to ensure water reaches the drainage holes.
- Unless the galvanized tub is very large and deep, you may be limited as to the type of vegetables and fruit that can be grown in the tub. Stay away from deep-rooted plants and root vegetables such as potatoes and corn. They will not have enough space to thrive in this environment. Plants such as tomatoes, peppers, cucumbers, strawberries and smaller carrots can be successfully grown in a container. Galvanized tubs can also be used for most herb varieties as well.
- One issue facing gardeners using galvanized steel tubs to grow food is the material and the process of galvanizing the tub. In order to galvanize a tub, it must be dipped into zinc. This zinc can flake off, leach into the soil and it may affect the quality of the soil in the tub. In order to combat this, place a layer of landscaping plastic between the soil, the heat barrier and the tub.
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