How to Divide Perennials — UK Guide 2026

Dividing perennials rejuvenates tired clumps, improves flowering, prevents overcrowding, and lets you create new plants for free. Below is your clear, practical UK guide to when and how to divide the main perennial groups grown at Dartana Plants, including links to recommended varieties and tips to help every division take successfully.

🌱 When & How to Divide UK Perennials (2026 Guide)

Dividing perennials is one of the most effective ways to maintain strong growth, improve vigour, and maximise flowering. The best timing depends entirely on the plant’s growth cycle — some divide beautifully in early spring, while others respond best just after flowering. Use the guide below to divide confidently and keep your borders thriving.

⭐ Best Perennials to Divide — With How‑To Instructions

Heuchera (Coral Bells)

When to divide: Spring, as new growth begins.
How:

• Lift the plant gently with a fork.
• Trim away tired or woody centres.
• Replant fresh outer crowns with strong roots.
  Shop Heuchera 

Bergenia (Elephant’s Ears)

When to divide: Spring or early autumn.
How:

• Lift the clump and split the rhizomes using a sharp knife or hands.
• Choose firm, chunky pieces with at least one growing point.
• Replant at the same depth and water generously.
  Shop Bergenia 

Primulas

When to divide: Immediately after flowering (late spring to early summer).
How:

• Ease the clump up gently and tease sections apart by hand.
• Ensure each division has leaves and healthy roots.
• Replant quickly — Primulas resent drying out.
  Shop Primulas

Daylilies (Hemerocallis)

When to divide: Every 3–4 years; best in spring or early autumn.
How:

• Dig up the crown and split into sections, each with 2–3 fans of leaves.
• Remove woody core if present.
• Replant divisions 40–60 cm apart for strong future clumps.
  
  

Kniphofia (Red Hot Poker)

When to divide: Spring (preferred) or early autumn.
How:

• Use a sharp spade to slice through the crown — Kniphofia are tough.
• Keep divisions large to reduce recovery time.
• Water well and mulch to protect young roots.
  Shop Kniphofia 

Vinca (Periwinkle)

When to divide: Spring or anytime in the growing season — very forgiving.
How:

• Lift and split clumps by hand or with secateurs.
• Vinca spreads easily, so even small pieces will root well.
• Replant in moist soil and allow to establish.
  Shop Vinca

🌼 Aftercare — Essential for Successful Divisions

• Water deeply and consistently for at least two weeks.
• Mulch around each plant to reduce stress and conserve moisture.
• Trim back top growth lightly if roots were reduced.
• Shade divisions temporarily during heatwaves or strong spring sun.

💬 FAQs

How often should you divide perennials?

Most perennials benefit from dividing every 2–5 years, depending on vigour and spread.

Should I water after dividing?

Yes — water deeply and regularly for the first two weeks to help divisions re‑establish.

Can you divide perennials in summer?

Some can, but it’s risky. Avoid hot spells and ensure excellent aftercare.

What tools do I need?

A garden fork, hand fork, sharp knife or spade, and a bucket of water for soaking roots.

How do I know a plant needs dividing?

Signs include weak flowering, a hollow centre, reduced growth, or plants pushing outward from the middle.