Splitting Rhubarb - Garden and Allotment Tips and Advice

What is the importance of Splitting Rhubarb? Here we will tell you why it needs doing, the benefits of doing it and when to split rhubarb.

Splitting Rhubarb: A Comprehensive Guide to Rejuvenating Your Patch

Introduction
Rhubarb, with its striking pinkish-red stalks and tangy flavor, is a long-lived perennial often passed down through gardens for generations. Although it can produce abundant harvests for many years, rhubarb plants eventually become crowded or less productive. Splitting or dividing your rhubarb is a simple, effective way to revitalize an aging plant, increase your yield, and even expand your patch by creating new plantings at no extra cost.

This comprehensive guide covers everything from identifying when and why to split rhubarb, the best timing and tools for the job, and step-by-step instructions for a successful division. By the end, you’ll be confident in your ability to split rhubarb, ensuring healthier, more productive plants for seasons to come.

Why Split Rhubarb?

1. Rejuvenate Aging Plants
Over time, rhubarb crowns can become congested, with multiple buds competing for nutrients. Dividing the plant into smaller sections gives each new crown access to fresh soil, better airflow, and a renewed nutrient supply, improving overall vigor and yield.

2. Increase Harvests
Splitting rhubarb can encourage stronger, thicker stalks and more abundant production. A well-maintained patch yields consistent crops, providing a steady supply of rhubarb for pies, preserves, and other culinary delights.

3. Expand Your Patch
Dividing established crowns not only revitalizes your current planting but also allows you to start new patches elsewhere in the garden or share healthy divisions with friends and neighbors.

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When to Split Rhubarb

Best Time of Year
The ideal time to split rhubarb is early spring before the new growth fully emerges or in autumn after the leaves have died back. Both periods find the plant in a relatively dormant state, minimizing stress and promoting quick establishment.

Frequency
Rhubarb doesn’t require frequent division. Generally, splitting every 5-8 years is sufficient, or whenever you notice a decline in productivity or thinner stalks. If the crown appears crowded or yields have diminished, it may be time to divide.

Preparing for the Job

Tools and Materials

Garden Fork or Spade: For lifting and digging around the crown.
Sharp Knife or Hatchet: To cut through tough roots cleanly.
Compost or Well-Rotted Manure: For enriching the soil where you’ll replant divisions.
Wheelbarrow or Tarp: To transport the lifted crown and any excess soil.
Protective Gloves: For grip and to avoid direct contact with soil-borne pathogens.

Soil and Site Preparation
Before splitting, prepare the new planting site. Rhubarb thrives in well-draining, fertile soil, slightly acidic (pH 6.0-7.0), enriched with organic matter. Choose a sunny spot with space for the divided crowns to spread out. Incorporating compost or well-rotted manure ensures the young divisions have the nutrients they need for a strong start.

Step-by-Step Guide to Splitting Rhubarb

Step 1: Identify the Crown
Locate the main rhubarb crown after the foliage has died back in autumn or before new shoots fully appear in spring. The crown should have multiple buds and visible growth points indicating potential divisions.

Step 2: Lift the Crown
Use a garden fork or spade to gently loosen the soil around the crown, working in a circle about 20-30 cm away from the base. Carefully lift the crown out of the ground, minimizing root damage. Shake off excess soil to expose the structure of the roots and buds.

Step 3: Examine the Crown
Inspect the lifted crown for signs of health. You should see multiple firm, plump buds and thick roots. Remove and discard any dead, diseased, or rotten portions to ensure only healthy sections remain.

Step 4: Divide into Sections
Using a sharp knife or hatchet, cut the crown into sections, ensuring each division has at least one strong bud (two or three buds are ideal) and a good portion of root. Aim for divisions about the size of a fist, though slightly larger is acceptable.

Step 5: Replant Immediately
Plant your newly created divisions as soon as possible. Dig holes large enough to accommodate the roots without bending. Position the buds so they sit just below the soil surface (2-3 cm deep). Gently backfill with soil, firming it around the roots to eliminate air pockets.

Step 6: Water Thoroughly and Mulch
Give each new division a generous watering to help roots settle and establish. Add a layer of compost or well-rotted manure around the plant, leaving space around the crown to prevent rot. Mulch helps retain moisture, suppress weeds, and maintain even soil temperatures.

Aftercare for Split Rhubarb

Initial Maintenance
Keep the soil consistently moist without waterlogging, especially during the first few weeks after planting. This helps the young divisions develop strong, deep roots. Avoid harvesting stalks in the first season after division, allowing the plant to focus on root establishment.

Feeding and Weeding
Rhubarb is a heavy feeder. Top-dress with compost or a balanced organic fertilizer in early spring and again in midsummer. Keep the area weed-free, as weeds compete for nutrients and water.

Patience Leads to Productivity
While it may be tempting to harvest soon after dividing, it’s best to let new divisions establish for a full season. Give them time to develop robust root systems. By the following year, your rhubarb should reward you with healthier growth and more bountiful stalks.

Troubleshooting Common Issues

Slow Establishment
If divisions seem slow to take off, review your soil conditions, watering practices, and nutrient availability. Consider adding more organic matter or adjusting watering frequency. With proper care, the plants should eventually settle in and thrive.

Wilted or Yellowing Leaves
Check for pests, such as slugs or snails, and ensure the soil isn’t waterlogged. Overly damp conditions can lead to root issues. Improve drainage, adjust watering, and maintain garden hygiene to prevent fungal diseases.

Poor Growth After Division
If the divisions continue to struggle, consider the quality of the original crown. If the parent plant was weak or diseased, divisions may inherit those problems. Remove and destroy any infected material, and consider acquiring a healthier rhubarb crown to start anew.

Enjoying the Benefits of Divided Rhubarb

More Productive Plants
By splitting rhubarb, you essentially press the “reset” button on an aging plant. Revitalized crowns produce sturdier stalks and improved yields, rewarding you with more rhubarb to enjoy in your cooking.

Expanded Garden
Splitting one crown into multiple sections lets you establish new patches around your garden or even share divisions with friends and neighbors. Spreading the rhubarb love strengthens community ties and promotes the joy of homegrown produce.

Culinary Possibilities
Once your divided rhubarb crowns mature, you can harvest more abundant, succulent stalks for classic rhubarb crumbles, jams, chutneys, and sauces. Experiment with new recipes and discover fresh ways to highlight rhubarb’s unique tangy-sweet flavor.

Conclusion

Splitting rhubarb is a simple yet powerful technique that keeps your patch productive, healthy, and well-maintained. By knowing when to divide, selecting strong divisions, and providing proper aftercare, you can breathe new life into an old crown, increasing yields and enhancing the overall vigor of your garden.

With just a bit of patience and attention, you’ll enjoy the satisfying results of rejuvenated rhubarb plants—bountiful harvests that bring tangy, delicious flavors to your kitchen year after year.