Rhubarb Not Growing: Troubleshooting and Solutions

Introduction

Rhubarb is a hardy and low-maintenance perennial plant that thrives in most gardens, but sometimes it doesn’t grow as expected. Issues like poor growth, small or thin stalks, or an overall unhealthy appearance can frustrate even the most experienced gardeners. Fortunately, most problems with rhubarb can be resolved with a bit of troubleshooting and care.

This guide will explore the common reasons why rhubarb might not be growing well and provide actionable solutions to get your plants back on track for a healthy and productive harvest.

Common Reasons Why Rhubarb Isn’t Growing

1. Poor Soil Conditions

• Problem: Rhubarb requires rich, well-draining soil to thrive. If the soil is too compacted, waterlogged, or nutrient-poor, the plant may struggle to grow.
• Solution:
  • Test your soil’s pH and aim for a range of 6.0-7.0.
  • Improve the soil by adding organic matter, such as compost or well-rotted manure.
  • Ensure good drainage to prevent waterlogging.

2. Overcrowding

• Problem: Mature rhubarb plants can become overcrowded, leading to competition for nutrients and stunted growth.
• Solution:
  • Divide the crowns every 5-7 years in early spring or autumn to rejuvenate the plant.
  • Replant divisions with enough space (3-4 feet apart) for proper growth.

3. Insufficient Sunlight

• Problem: Rhubarb needs full sun to grow well. If it’s planted in a shaded area, growth may be slow or weak.
• Solution:
  • Transplant the rhubarb to a sunnier location.
  • Ensure the new spot receives at least 6-8 hours of direct sunlight daily.

4. Underwatering or Overwatering

• Problem: Both underwatering and overwatering can stress the plant and hinder growth.
• Solution:
  • Water rhubarb regularly during dry spells, especially in the first year.
  • Avoid overwatering to prevent waterlogged soil, which can cause root rot.

5. Nutrient Deficiency

• Problem: A lack of nutrients, particularly nitrogen, phosphorus, and potassium, can result in poor growth.
• Solution:
  • Feed rhubarb with a balanced fertilizer in early spring as new growth begins.
  • Mulch with well-rotted manure or compost to provide a slow release of nutrients.

6. Flowering (Bolting)

• Problem: When rhubarb produces flower stalks, it redirects energy away from growing edible stalks.
• Solution:
  • Remove flower stalks as soon as they appear to encourage vegetative growth.
  • Ensure the plant isn’t stressed by factors like overcrowding, drought, or poor nutrition.

7. Crown Rot

• Problem: Waterlogged soil can cause the crown to rot, leading to weak or no growth.
• Solution:
  • Improve soil drainage by planting rhubarb in raised beds or mounds.
  • Avoid overwatering and ensure the crown is planted just above soil level.

8. Planting Too Deep

• Problem: If the crown is planted too deep, it may struggle to grow or produce healthy stalks.
• Solution:
  • Ensure the crown is planted with the buds just above the soil surface.

9. Age of the Plant

• Problem: Older rhubarb plants may become less productive over time.
• Solution:
  • Divide and replant older rhubarb crowns to rejuvenate growth.
  • Consider planting new crowns every 5-7 years to maintain productivity.

10. Pests and Diseases

• Problem: Pests like slugs and snails or diseases like leaf spot can weaken the plant.
• Solution:
  • Remove slugs and snails manually or use organic slug deterrents.
  • Treat fungal diseases with appropriate fungicides or by improving airflow around the plant.

How to Encourage Healthy Rhubarb Growth

1. Planting Tips

• Plant rhubarb in a sunny location with rich, well-draining soil.
• Space plants 3-4 feet apart to allow for adequate airflow and growth.

2. Feeding and Mulching

• Feed rhubarb with a balanced fertilizer in early spring and again in mid-summer if necessary.
• Mulch with organic matter to retain moisture, suppress weeds, and provide nutrients.

3. Watering

• Water regularly during dry periods, especially in the first year.
• Avoid overwatering to prevent root rot.

4. Dividing Crowns

• Divide overcrowded crowns every 5-7 years to maintain vigor.
• Replant divisions in nutrient-rich soil with the crown just above the soil surface.

5. Seasonal Maintenance

• Remove dead or yellowing leaves to improve airflow and reduce the risk of disease.
• Cut back the plant in late autumn and mulch the crown to protect it from frost.

FAQs About Rhubarb Not Growing

1. Why is my rhubarb not producing stalks?

• Your rhubarb may be overcrowded, underfed, or stressed. Divide the crown, feed the plant, and ensure proper watering.

2. How do I fix slow-growing rhubarb?

• Test the soil for pH and nutrient levels, improve drainage, and ensure the plant receives enough sunlight.

3. Can I save rhubarb with crown rot?

• It’s difficult to save a plant with advanced crown rot. Prevent future issues by improving drainage and avoiding overwatering.

4. Why is my rhubarb flowering?

• Flowering is a sign of stress or the plant’s age. Remove flower stalks and ensure the plant has adequate nutrition and space.

5. Should I fertilize rhubarb?

• Yes, fertilize in early spring with a balanced fertilizer or compost to promote healthy growth.

6. How often should I water rhubarb?

• Water during dry spells, keeping the soil consistently moist but not waterlogged.

7. Can I move my rhubarb plant to a better spot?

• Yes, transplant rhubarb in early spring or autumn to a sunnier location with well-draining soil.

8. Why are my rhubarb stalks thin?

• Thin stalks can result from overcrowding, poor nutrition, or lack of water. Address these issues to improve growth.

9. How do I divide rhubarb plants?

• Dig up the crown in early spring or autumn, split it into sections with at least one bud each, and replant.

10. How do I improve poor soil for rhubarb?

• Add compost, well-rotted manure, or organic matter to enrich the soil and improve drainage.

Conclusion

If your rhubarb isn’t growing, it’s usually due to environmental factors, improper care, or plant stress. By addressing issues like poor soil, overcrowding, lack of sunlight, or insufficient nutrients, you can encourage healthy growth and enjoy a productive rhubarb plant for years to come. With a little attention and effort, your rhubarb will thrive and reward you with abundant stalks for your favorite recipes.

Start troubleshooting your rhubarb today and enjoy the satisfaction of a flourishing, healthy plant!