After peonies finish flowering, the care you give them determines how healthy they will be next year. Many gardeners focus on the spectacular blooms in spring but overlook the important maintenance that happens afterward. Here are 10 critical things you should do right after your peonies bloom, with detailed explanations.
1. Deadhead the Spent Flowers
One of the first jobs is removing faded blooms, a process known as deadheading.
Why it’s important:
- Prevents the plant from wasting energy producing seeds.
- Directs energy back into strengthening the roots and developing next year’s flower buds.
- Keeps the plant looking tidy.
- Reduces the risk of fungal diseases developing on decaying petals.
How to do it:
- Use clean, sharp pruning shears.
- Cut just below the spent flower, above the first set of healthy leaves.
- Avoid removing large portions of the stem.
Do not cut all the foliage at this stage.
2. Leave the Leaves Alone
Many gardeners make the mistake of cutting back peony foliage immediately after flowering.
Don’t do this.
The leaves are still working hard.
During summer they:
- Produce sugars through photosynthesis.
- Feed the underground roots.
- Build energy reserves.
- Form flower buds for the following spring.
Removing healthy leaves too early can greatly reduce blooming next year.
Keep the foliage until autumn unless it becomes diseased.
3. Inspect for Diseases
After flowering, inspect every plant carefully.
Look for:
- Black spots
- Powdery white coating
- Brown stems
- Wilted shoots
- Grey mould
- Yellowing leaves
Common problems include:
- Botrytis blight
- Powdery mildew
- Leaf spot
If you find infected leaves:
- Remove affected portions immediately.
- Dispose of them in the rubbish rather than composting.
- Improve air circulation around the plant.
4. Water Deeply During Dry Weather
Although peonies become fairly drought tolerant once established, they still need moisture after flowering.
Why?
The plant is actively growing roots and preparing next year’s flower buds.
Watering tips:
- Water deeply once a week during dry spells.
- Aim for about 2.5 cm (1 inch) of water weekly.
- Water at soil level rather than overhead.
- Morning watering is best.
Avoid constantly soggy soil because peony roots dislike sitting in water.
5. Feed Carefully (If Needed)
Peonies are not heavy feeders.
Too much fertiliser can produce lush leaves but very few flowers.
If feeding:
- Use a low-nitrogen fertiliser.
- Choose one with more phosphorus and potassium.
- Apply lightly around the drip line.
- Water well afterward.
Compost is also an excellent slow-release nutrient source.
6. Mulch Correctly
A light mulch helps:
- Keep soil cool.
- Retain moisture.
- Reduce weeds.
- Improve soil over time.
Good mulch choices:
- Compost
- Shredded bark
- Leaf mould
Keep mulch several centimetres away from the crown.
Never bury the crown under thick mulch, as this can reduce flowering and encourage rot.
7. Control Weeds
Weeds compete with peonies for:
- Water
- Nutrients
- Sunlight
Remove weeds regularly by hand.
Avoid cultivating deeply because peony roots grow close to the surface and can be damaged.
Mulching also helps suppress new weeds.
8. Support the Foliage
After flowering, the stems remain important because they continue feeding the roots.
Heavy rain or wind may cause stems to flop.
If necessary:
- Install peony rings or plant supports.
- Tie stems loosely with soft garden twine.
- Avoid crowding the foliage.
Good airflow helps reduce fungal diseases.
9. Mark the Plant’s Location
By midsummer, peonies may blend into surrounding plants.
Mark their location with:
- Plant labels
- Garden stakes
- Decorative markers
This prevents accidentally digging into the roots when planting bulbs or dividing nearby perennials later in the season.
10. Plan for Autumn Cleanup
Don’t cut back healthy foliage now.
Wait until:
- Leaves turn yellow or brown naturally.
- The first hard frost arrives.
Then:
- Cut stems down to about 2–5 cm (1–2 inches) above the ground.
- Remove all plant debris.
- Dispose of diseased material rather than composting it.
Autumn cleanup helps reduce diseases that can overwinter in old foliage.
Bonus Tip: Resist the Urge to Move Peonies
Peonies dislike being transplanted and often take one to three years to recover before blooming well again.
Only move them if absolutely necessary, such as:
- They receive less than six hours of sunlight.
- The area has become overcrowded.
- Drainage is poor.
- You need to divide an old, overcrowded clump (best done in early autumn).
Common Mistakes to Avoid
- ❌ Cutting all the leaves off after flowering.
- ❌ Overwatering or allowing waterlogged soil.
- ❌ Applying too much high-nitrogen fertiliser.
- ❌ Covering the crown with a thick layer of mulch.
- ❌ Ignoring signs of fungal disease.
- ❌ Transplanting unnecessarily.
- ❌ Leaving diseased foliage in the garden over winter.
With proper post-bloom care, peonies can thrive for decades—often producing larger, healthier plants and increasingly abundant flowers each spring.