Growing Rhubarb in Pots in the UK: A Step-by-Step Guide

Introduction

Growing rhubarb in pots is an excellent solution for gardeners with limited space or those who prefer container gardening. While rhubarb is traditionally grown in garden beds, it thrives just as well in pots when given the right care. With its vibrant red stalks and large leaves, rhubarb not only provides delicious harvests but also adds an ornamental touch to patios and balconies.

This guide is tailored for UK gardeners and covers everything you need to know about growing rhubarb in pots, from choosing the right container to planting, caring for, and harvesting your crop.

Why Grow Rhubarb in Pots?

Space-Saving: Perfect for small gardens, patios, balconies, or urban spaces.
Portability: Pots can be moved to sunnier spots or sheltered locations in bad weather.
Pest Control: Growing in pots keeps rhubarb off the ground and away from common pests like slugs and snails.
Better Drainage: Containers provide excellent drainage, reducing the risk of crown rot.
Aesthetic Appeal: Rhubarb’s bold foliage and colorful stalks make it a decorative addition to any outdoor space.

Choosing the Right Pot for Rhubarb

1. Size

Use a pot that is at least 18 inches deep and wide to accommodate the plant’s large root system.
Larger pots are better for allowing the rhubarb to grow fully and ensuring long-term health.

2. Material

Plastic Pots: Lightweight and retain moisture well.
Terracotta Pots: Breathable and decorative but may dry out quickly.
Fabric Pots: Promote good airflow and are easy to move.

3. Drainage

Ensure the pot has adequate drainage holes at the bottom to prevent waterlogging.

Best Rhubarb Varieties for Pots

1. Timperley Early

Description: Produces tender, pink-red stalks early in the season.
Best For: Early harvesting and smaller spaces.

2. Victoria

Description: A traditional variety with thick, greenish-red stalks.
Best For: Heavy cropping in larger containers.

3. Champagne

Description: Known for its slender, sweet stalks and vibrant red color.
Best For: Dessert recipes and smaller pots.

4. Glaskins Perpetual

Description: Produces sweet stalks well into the late season.
Best For: Continuous harvesting throughout summer.

Preparing to Grow Rhubarb in Pots

1. Soil

Use a rich, well-draining compost mix.
Add organic matter such as compost or well-rotted manure to improve fertility.
Aim for a slightly acidic to neutral soil pH (6.0-7.0).

2. Fertilizer

Mix a slow-release, balanced fertilizer into the compost before planting.
Consider using organic fertilizers like fish, blood, and bone meal for long-term nourishment.

How to Plant Rhubarb in Pots

1. Planting Bare-Root Crowns

Fill the pot halfway with the prepared compost mix.
Position the crown with the buds facing upward and just above the soil surface.
Backfill with compost, leaving the crown exposed to prevent rot.
Water thoroughly to help establish the roots.

2. Planting Potted Rhubarb

Remove the rhubarb plant from its original container and gently loosen the roots.
Follow the same steps as planting bare-root crowns.

3. Spacing

Only plant one rhubarb crown per pot to ensure enough room for growth.

Caring for Rhubarb in Pots

1. Watering

Water regularly, especially during dry spells, to keep the soil consistently moist but not waterlogged.
Avoid letting the soil dry out completely, as this can stress the plant.

2. Fertilizing

Apply a liquid fertilizer every 4-6 weeks during the growing season.
Use a high-potassium feed when the plant starts to produce stalks to encourage healthy growth.

3. Mulching

Add a layer of mulch, such as straw or wood chips, to retain moisture and keep the roots cool.

4. Pruning and Maintenance

Remove yellowing or dead leaves to improve airflow and reduce the risk of disease.
Cut off flower stalks as soon as they appear to redirect energy into growing edible stalks.

Protecting Potted Rhubarb in the UK Climate

1. Frost Protection

In late autumn, move the pot to a sheltered spot or cover the crown with fleece to protect it from frost.

2. Sheltering from Wind

Place the pot in a location that is protected from strong winds to prevent damage to the large leaves.

3. Overwintering

Cut back the foliage in late autumn and add a thick layer of mulch over the crown for winter protection.

Harvesting Rhubarb in Pots

1. When to Harvest

Avoid harvesting in the first year to allow the plant to establish.
Start harvesting in the second year, from mid-spring to early summer.

2. How to Harvest

Hold the stalk near the base and twist gently to pull it away.
Alternatively, use a sharp knife to cut the stalk at the base.
Harvest only one-third of the stalks at a time to avoid stressing the plant.

3. Harvesting Tips

Only harvest stalks that are 12-18 inches long.
Discard the leaves, as they are toxic due to high oxalic acid content.

Common Problems with Potted Rhubarb and Solutions

1. Dry Soil

Cause: Pots can dry out quickly in warm weather.
Solution: Water regularly and add mulch to retain moisture.

2. Root Rot

Cause: Overwatering or poor drainage.
Solution: Ensure the pot has proper drainage and avoid waterlogging the soil.

3. Weak Growth

Cause: Nutrient deficiency or insufficient sunlight.
Solution: Feed regularly with a balanced fertilizer and place the pot in full sun.

4. Small or Thin Stalks

Cause: Overcrowding or lack of nutrients.
Solution: Use a larger pot and feed the plant regularly.

FAQs About Growing Rhubarb in Pots

1. Can rhubarb be grown in pots in the UK?
Yes, rhubarb grows well in pots with the right care, making it perfect for small spaces.

2. How big should the pot be for rhubarb?
Use a pot at least 18 inches deep and wide to accommodate the plant’s roots.

3. How often should I water potted rhubarb?
Water regularly, keeping the soil moist but not waterlogged, especially during dry spells.

4. Can I grow rhubarb indoors?
Rhubarb prefers outdoor conditions but can be grown indoors temporarily if there is ample light.

5. Do I need to fertilize rhubarb in pots?
Yes, use a balanced fertilizer regularly during the growing season to ensure healthy growth.

6. How long does rhubarb take to grow in pots?
Rhubarb takes about two years to establish before producing a full harvest.

7. Can rhubarb survive winter in pots?
Yes, with proper winter protection like mulch or moving the pot to a sheltered area, rhubarb can survive frosts.

8. How do I prevent root rot in potted rhubarb?
Ensure the pot has drainage holes and avoid overwatering.

9. What’s the best fertilizer for rhubarb in pots?
A balanced fertilizer or a high-potassium feed is ideal for rhubarb grown in containers.

10. How long can rhubarb stay in a pot?
With proper care, rhubarb can thrive in a pot for several years, though repotting or dividing may be necessary after 3-5 years.

Conclusion

Growing rhubarb in pots is a practical and rewarding way to enjoy this versatile plant, especially for gardeners with limited space. With the right pot, soil, and care, rhubarb can thrive and provide you with delicious harvests for years to come. Whether you’re gardening on a patio, balcony, or small backyard, this guide will help you grow healthy and productive rhubarb plants in containers.

Start growing rhubarb in pots today and enjoy the sweet satisfaction of homegrown produce!