The Ultimate Guide to Container Gardening: Rhubarb Edition

Rhubarb is a pretty awesome plant with its tangy and vibrant stalks. It’s a popular choice for those of us who have limited garden space because you can easily grow it in containers. Container gardening is the way to go if you want to have control over the soil conditions and position your rhubarb plant in the perfect spot for it to grow like crazy. This guide is here to help you grow rhubarb in containers like a pro, so you’ll have a healthy and productive plant in no time. Let’s get started!

Choosing the Right Container

1. Size: Rhubarb plants need a large container to accommodate their extensive root system. Choose a pot that is at least 20 inches in diameter and 20 inches deep. Larger containers are even better, providing more room for root growth and moisture retention.
2. Material: Containers made of sturdy materials like plastic, ceramic, or wood are ideal. Ensure the pot has adequate drainage holes to prevent waterlogging, which can lead to root rot.
3. Placement: Place the container in a location that receives at least 6-8 hours of direct sunlight each day. Rhubarb thrives in full sun, although it can tolerate partial shade.

Preparing the Soil

1. Soil Mix: Use a high-quality potting mix that is rich in organic matter. Rhubarb prefers well-draining soil with a slightly acidic to neutral pH (6.0-7.0). Mix in compost or well-rotted manure to improve fertility.
2. Drainage: Ensure good drainage by placing a layer of gravel or broken pottery at the bottom of the container before adding the soil mix. This helps prevent water from accumulating at the roots.

Planting Rhubarb

1. Timing: Plant rhubarb crowns (dormant roots) in early spring as soon as the soil can be worked. In warmer climates, fall planting is also an option.
2. Planting Depth: Fill the container with soil mix, leaving about 2-3 inches of space at the top. Place the rhubarb crown in the center of the pot with the buds facing upwards. Cover the crown with 1-2 inches of soil, ensuring the buds are just below the surface.
3. Watering: Water the newly planted crown thoroughly to help settle the soil and eliminate air pockets. Keep the soil consistently moist but not waterlogged.

Caring for Container-Grown Rhubarb

1. Mulching: Apply a layer of mulch on top of the soil to retain moisture, suppress weeds, and regulate soil temperature. Straw, wood chips, or compost work well as mulching materials.
2. Watering: Rhubarb requires regular watering, especially during dry spells. Aim to keep the soil consistently moist but not soggy. Water deeply once a week or more often in hot weather.
3. Fertilizing: Feed your rhubarb plant with a balanced, slow-release fertilizer in early spring. Supplement with liquid fertilizer every 4-6 weeks during the growing season. Avoid high-nitrogen fertilizers, which can promote excessive leafy growth at the expense of stalk production.
4. Support: As the plant grows, it may need support to keep the leaves and stalks upright. Use stakes or a tomato cage to provide stability and prevent the plant from toppling over.
5. Winter Care: In colder climates, protect the container from freezing temperatures by moving it to a sheltered location or wrapping it with insulation. Rhubarb is hardy, but container plants are more susceptible to temperature fluctuations.

Harvesting Rhubarb

1. Timing: Do not harvest rhubarb during the first year to allow the plant to establish a strong root system. In the second year, harvest lightly, and from the third year onwards, you can harvest more abundantly.
2. Harvest Method: Harvest rhubarb stalks when they are 12-18 inches long. Grasp the stalk near the base and pull it gently but firmly away from the plant. Avoid cutting the stalks, as this can increase the risk of disease.
3. Leaves: Rhubarb leaves are toxic due to high levels of oxalic acid. Discard the leaves and only use the stalks for cooking.

Storing and Using Rhubarb

• Fresh Storage: Store fresh rhubarb stalks in the refrigerator, wrapped in plastic or placed in a container, for up to two weeks.
• Preserving: Rhubarb can be frozen, canned, or made into jams and sauces for long-term storage. To freeze, cut the stalks into pieces, spread them on a baking sheet, freeze until solid, and then transfer to airtight containers.

Conclusion

Growing rhubarb in containers is a rewarding and practical way to enjoy this versatile plant, even if you have limited space. By choosing the right container, preparing the soil properly, and following best practices for planting and care, you can enjoy a bountiful harvest of tart, flavorful rhubarb stalks. Whether used in pies, sauces, or preserves, homegrown rhubarb is a delightful addition to any garden. Happy gardening!