Daisy pruning (Leucanthemum): keeping them healthy

What is a daisy?

Daisy plants (Leucanthemum vulgare, also Shasta Daisy) are lovely, simple flowers with white petals and yellow centres. They grow easily, flower for long (June through September) and are reliable. But they have a drawback: they grow wild and ragged. Without good pruning, your daisies quickly become ungainly, hollow plants with lots of foliage but few flowers below.

Fortunately, pruning daisies is very simple. With regular pinching and cutting, you get compact, rounded plants full of white blooms.

The three-step approach: pruning in spring

Daisies get three pruning sessions per season:

1. Spring (April): Hard cutback
2. Summer (June): Pinching after bloom
3. Autumn (September): Cleanup

This sounds like a lot, but it takes just two to three minutes per plant each time.

Spring: basic cutback in April

In April, when you see your daisy is making new growth (green shoots), prune it back. Cut all stems from last year back to about 15-20 cm above ground. This looks harsh, but it works. Your daisy now grows as a compact ball upward.

Also remove any dead stems - those are dark brown and brittle.

Summer: pinching after first bloom

In June and July your daisy will flower. After about two to three weeks of bloom you will see flowers beginning to droop. This is the time to pinch.

The pinching technique:

Grab a handful of flowers. Pinch off all wilted blooms with your fingers. This takes only a few minutes. Why? Because your daisy puts all its energy into seed production once it sets seed. By removing flowers before they set seed, you force the plant to make more flowers.

You will see that within two weeks twice as many flowers appear. You repeat this throughout July and August.

Autumn: cleanup in September

In September, after first frosts, your daisy will slowly die back. The flower tops turn black. At that point you snip off all dead stems, down to about 5-10 cm above ground.

Why not earlier? Because dead wood provides protection against extreme frost. You do not want to cut too much in late autumn.

Preventing lodging (plants that open up)

As your daisies age (three to four years) they sometimes start opening up - the plant grows thicker on the outside and hollow in the centre. This is called lodging. You can prevent this:

• Prune at least once a month
• Don't leave stems longer than two cm rooting in the centre
• Divide old plants after three years

Division and propagation

After three years your daisy becomes large. You can now divide it. Dig the plant out carefully. You see many thin black roots. With a sharp spade cut this into two to four pieces. Make sure each piece has some green shoots. Plant these separately. This gives you more plants.

You can also save seeds. Let a few flowers (at least five) die and set seed on the plant. Pick these in October and save them. Sow them in March in trays.

Step-by-step

Step 1: Cut back in April

In April cut all stems from last year back to 15-20 cm. Remove dead wood.

Step 2: Pinch wilted flowers off in June-July

As flowers droop, pinch them off with your fingers. This stimulates more flowers.

Step 3: Repeat pinching through July and August

Repeat this every two to three weeks. This gives you far more flowers.

Step 4: Cleanup in September

Cut all dead stems away to 5-10 cm. This protects against frost.

Frequently asked questions

My daisy doesn't get compact - why?

You probably are not cutting back hard enough. In April you must cut hard back to 15-20 cm. You also must pinch regularly, not just let it grow.

How many times per year do I prune my daisy?

At least three times per season: April (basic), June (pinching), September (cleanup). But you can pinch more - it cannot go wrong.

Can I still prune them in November?

Not anymore. November is too late. Your daisy needs dead wood as protection against winter. Leave until April.

Which cultivars prune differently?

'Wirral Supreme' (double flowers) must be treated slightly more carefully, as the double flowers break off more easily. But the system remains the same: April cutback, June pinching.

My daisy grows outward without growth in the centre - can I repair this?

This is lodging. Cut back harder, to 10 cm in April. Or divide the plant. This revitalises it.

Discover your own garden design

At [gardenworld.app](https://gardenworld.app) you can upload your front yard and see how your daisies fit - with realistic growth forms and surrounding plantings. Plan and visualise before you pick up the secateurs.