Deadheading perennials in June: extend blooming season

What is deadheading and why in June?

Deadheading is removing faded (dead) flowers from living plants. It sounds harsh - you are cutting blooms off - but it is a real secret weapon. A plant grows flowers to make seeds. Once you remove that faded flower, the plant thinks: "Oops, I failed. I must make MORE flowers." So the plant blooms much more often and much longer.

In June the first flowers of your perennials have just faded. This is the perfect time. You help them through a second, third, and sometimes fourth blooming wave in one season.

TL;DR

• Deadhead weekly: remove faded flowers (not whole leaf)
• Cut just below the flower head to the next leaf
• Works for roses, lavender, salvia, agapanthus, and many more
• Deadheading extends bloom until September
• Check daily for new wilted flowers

Three types of perennial bloomers

There are three groups of perennials, each with a deadheading strategy:

Type 1: Single flowers per stem (rose, peony, dahlia)

These plants make one large flower per stem. Once that flower fades, you cut it off.

How you do it: Cut just below the bloom (about 1-2 cm under the flower) to the next leaf with at least two leaflets. That leaf will bud out and make three or four new flower stems. Genius!

Example: You have a rose that just faded. You cut that flower off just above the first leaf with at least two leaflets. In two weeks you have three new rose stems with flowers.

Type 2: Flower spikes (lavender, salvia, delphinium, agapanthus)

These plants make long or short spikes of flowers. The whole spike blooms mostly at once.

How you do it: Cut the entire spike off (not just the top). Cut to the next healthy leaf or leaf bud. The plant will make new flower spikes from leaf buds further down the stem.

Example: You have a lavender spike that has turned purple when faded. You cut the whole spike off. The plant makes two-three new spikes on lower leaf buds. These bloom in July-August.

Type 3: Many tiny flowers (thistle, achillea, coreopsis)

These plants make lots of small flowers on one flowerhead.

How you do it: Cut the entire flowerhead off once it is mostly faded (preference: 50% still blooming, 50% faded). This makes room for new flowerheads.

Example: Coreopsis has lots of tiny yellow flowers. Once 50% faded, you cut the whole main flowerhead off. Two weeks later you have new flowerheads on it.

Deadheading step by step

Step 1: Check your garden

Walk through your garden every morning or evening. See which flowers are faded. Rose faded? Lavender spike brown? Note mentally what you will cut off.

Step 2: Prepare shears

Sharp pruning shears are essential. Dull shears damage stems and create infections. Disinfect between cuts (70% alcohol or bleach water) if you have many plants.

Step 3: Cut in the right place

Do NOT cut right under the flower - cut at least 2-3 cm below, to the next leaf or leaf bud. This makes room for new growth.

Correct: Cut to the first leaf with at least two leaflets Wrong: Cut right under bloom or very far away (more than 10 cm)

Step 4: Clean cut

Good cutting gives a clean break. Bad cut (breaks, frays) creates disease. Always cut toward a leaf, not away from plant.

Step 5: Remove the faded flower

Toss away or compost. Do not leave on ground (can attract disease).

Which plants to deadhead, which not?

Deadhead these plants (aggressive):

• Rose - deadhead weekly, blooms much better
• Lavender - once spikes fade, cut off
• Salvia - spikes off, new ones come
• Agapanthus - after bloom whole spike off
• Thistle - flowerheads off for second bloom
• Coreopsis - flowerhead off
• Delphinium - spike off
• Achillea - flowerhead off

DO NOT deadhead these plants:

• Grasses - they look beautiful as seed heads
• Sedum - brown flowers look nice
• Rudbeckia - seed heads attract birds
• Sunflower - seeds are food
• Daisy - stays pretty long

Timing: When exactly to deadhead?

June: First flowers fade. Deadhead all roses, lavender, and delphiniums that just faded. This gives second bloom wave in July-August.

July: Repeat. Many plants bloom for the second time now. Deadhead again for third wave.

August: Slower now. Many plants tire. Deadhead only strong bloomers (rose, lavender).

September: Stop. Leave seed heads. Birds eat them, and they look nice.

Preferred cultivars for deadheading

Rose:

• David Austin roses: very suitable for deadheading
• Knock Out roses: almost ALWAYS want deadheading
• Heath roses: fine for deadheading

Lavender:

• Lavandula angustifolia (true lavender): great deadheader
• Lavandula stoechas (Spanish lavender): less needed, but helps

Salvia:

• Salvia nemorosa: deadhead aggressively
• Salvia garantica: blooms constantly with deadheading

Agapanthus:

• Agapanthus africanus: deadhead whole spike

Frequently asked questions

Can I deadhead with my fingers instead of shears?

On soft stems you can: pinch off gently. But thick stems (rose, dahlia) you damage with fingers. Shears are safer.

Do I have to deadhead every day?

Not every day - too much work. Once per week is enough. Walk Sunday, Wednesday and deadhead what is faded.

Does a plant look messy after deadheading?

Yes, first day - you have leaf stems without flowers. But in two weeks the new flowers are back and the plant looks much fuller.

My lavender does not bloom after deadheading. Why?

Rarely happens. Check water (lavender hates wet feet) and sun (6+ hours full light). Not all lavender blooms twice - some are "one-timer."

Can I mix deadheading with pruning?

Yes! Deadheading IS a form of pruning. You help the plant climb by cutting correctly.

Step-by-step plan

Step 1: Identify your perennials

Which do you have? Which want bloom extension (roses: YES; grasses: NO)?

Step 2: Set deadheading on weekly schedule

Sunday or Wednesday: walk through garden, see which faded.

Step 3: Gather shears plus disinfectant

Sharp shears, 70% alcohol in spray bottle.

Step 4: Cut at correct height

Not right under flower, to first leaf (minimum two leaflets).

Step 5: Note results

Your first deadheading should bring second bloom in 2-3 weeks. Note which plants respond well - you deadhead those again next year.

Frequently asked questions

What if I cut everything off and no flowers come back?

Rarely happens. You never cut everything away - only faded parts. Healthy leaves remain. New bloom usually follows.

My deadheading gives no extra bloom. Is it me?

Possible reasons:

1. Plant does not get enough sun (roses want 6+ hours)
2. Water too much (especially roses hate wet feet)
3. Nutrition too low (deadheading uses energy)
4. Plant too young or too old

Deadhead and feed at same time?

Perfect! June is good time for feeding AND deadheading. Feed in June, then plants have energy for second bloom wave.

Discover your own garden design

At [gardenworld.app](https://gardenworld.app) you can upload your front yard and see which perennials can benefit from deadheading - with long bloom periods from April until September. Plan your extended-bloom garden before you start cutting.