Can Rhubarb Be Planted in a Large Pot?

Rhubarb is a perennial vegetable that is often grown for its tart, tangy stalks which are used in pies, jams, and other desserts. While it is typically planted directly in the ground, many gardeners wonder if it is possible to grow rhubarb in a large pot. The answer is yes, but there are a few important things to keep in mind if you want to successfully grow rhubarb in a container.

Choosing the Right Pot

The first thing to consider when planting rhubarb in a pot is the size of the container. Rhubarb plants have deep, extensive roots, so you will need a pot that is at least 18 inches deep and 20 inches wide. Additionally, make sure the pot has good drainage holes to prevent water from accumulating in the bottom and causing root rot.

Choose a pot made of a durable material, such as ceramic, terracotta or plastic. Avoid metal pots, as they can get too hot and damage the roots. Make sure you have a sturdy base for your pot as a mature rhubarb plant can weigh up to 20 pounds.

Soil and Fertilizer

When planting rhubarb in a pot, it is important to use high-quality soil. Choose a potting mix that is rich in organic matter and has good drainage. Do not use garden soil as it is often too heavy and can compact in a pot, suffocating the roots.

Rhubarb is a heavy feeder and will require regular fertilization to thrive. Use a balanced fertilizer, such as a 10-10-10 or 20-20-20, every three to four weeks during the growing season. Follow the manufacturer's instructions for application rates.

Watering and Sunlight Requirements

Rhubarb plants require regular watering to keep the soil moist, but not waterlogged. Water the pot deeply once a week and apply enough water so that it runs out of the drainage holes. However, avoid leaving the pot sitting in water to prevent root rot. During hot, dry weather, you may need to water more frequently.

Rhubarb plants also need plenty of sunlight to thrive. Choose a location for your pot where it will receive at least six hours of direct sunlight per day. If you don't have a sunny spot, you can supplement with grow lights.

Harvesting Rhubarb from a Pot

Once your rhubarb plant is established in the pot, you can begin to harvest the stalks. Do not harvest the first year after planting, as the plant needs time to establish roots. In subsequent years, you can harvest rhubarb stalks that are at least 8 inches long. Grasp the stalk near the base and pull it downward, twisting it slightly to snap it off. Leave a few stalks on the plant to allow it to continue growing and producing.

Overall, growing rhubarb in a large pot is possible with the right conditions and care. With proper watering, fertilization and sunlight, you can enjoy fresh rhubarb from your container garden.