Will a Galvanized Tub Kill Water Plants?

Galvanized tubs have become a popular choice for gardeners looking for alternative plant containers. However, there is some concern about whether or not these metal containers can harm water plants. In this article, we will explore the question of whether a galvanized tub can kill water plants.

What is a Galvanized Tub?

A galvanized tub is a metal container that has been treated with a layer of zinc. The zinc coating prevents the metal from rusting and prolongs the life of the container. These containers are commonly used for livestock watering, beer-making, and as plant containers. They come in a variety of sizes and shapes, making them a versatile choice for gardeners.

What Are Water Plants?

Water plants are plants that grow in and around bodies of water such as ponds, lakes, and wetlands. They can be divided into two categories: submerged and emergent. Submerged plants grow completely underwater, while emergent plants are rooted in the soil below the water surface and have leaves and stems that extend above the waterline. Some common examples of water plants include water lilies, iris, and cattails.

Can a Galvanized Tub Harm Water Plants?

There is some concern that the zinc coating on galvanized tubs can leach into the water and harm water plants. Zinc is a trace element that is essential for plant growth, but in high concentrations, it can be toxic to plants. The amount of zinc that leaches into the water from a galvanized tub depends on several factors including the pH of the water, the temperature, and the age of the container.

In general, a new galvanized tub is less likely to harm water plants than an old one. The zinc coating on a new container is thicker and less likely to wear away than an older container. Additionally, if the water in the container is slightly acidic (pH 6.5 or lower), it is less likely to leach zinc from the container.

How to Use a Galvanized Tub Safely with Water Plants

If you want to use a galvanized tub as a container for water plants, there are several steps you can take to minimize the risk of harm to your plants:

Choose a new or relatively new galvanized tub.

Fill the container with water and let it sit for a week to allow the zinc coating to stabilize.

Test the pH of the water. If it is acidic (pH 6.5 or lower), the risk of zinc leaching is reduced.

Fill the container with a mix of half tap water and half rainwater.

Following these steps can help ensure that your water plants thrive in a galvanized tub without being harmed by zinc leaching from the container.

The Bottom Line

A galvanized tub can make an attractive and practical container for water plants. While there is some risk of zinc leaching from the container and harming the plants, following the steps outlined in this article can help minimize this risk. By using a new or relatively new container, testing the pH of the water, and filling the container with a mix of tap and rainwater, you can enjoy the benefits of a galvanized tub without harming your water plants.