
Pruning tree peonies is a crucial step in maintaining their optimal growth and blooms. This process helps to promote healthy growth, encourages new blooms, and prevents the plant from becoming leggy.
To prune tree peonies, you should remove any dead or damaged branches in late winter or early spring. This is typically around February or March, depending on your location.
Pruning in the dormant season allows the plant to focus its energy on producing new growth rather than fighting off disease. Cutting back dead or damaged branches also helps to prevent the spread of disease to the rest of the plant.
By pruning your tree peony in the dormant season, you can expect to see a 20-30% increase in blooms the following year. This is because the plant is able to redirect its energy towards producing new flowers rather than maintaining old growth.
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Pruning Basics
Tree peonies can take time to become well established, so it's best to leave them untouched for the first couple of years. This allows them to establish a strong root system and grow into healthy plants.
Pruning should be done with sharp tools, including a pruning saw or loppers and a sharp pair of secateurs. Use these tools to remove any dead wood, which can be a major source of infection and decay.
Deadheading is an essential part of pruning tree peonies. This involves removing the faded flowers after they've bloomed, which encourages the plant to focus its energy on producing more flowers.
Here's a step-by-step guide to pruning a tree peony:
- Remove any dead wood back to a healthy bud.
- Cut a few stems back to new buds at soil level, or to within 15cm of the ground, to improve the shape of your tree peony or reduce its size.
- Cut leggy stems back by a third to stimulate bushy growth.
- Take out one or two old stems to ground level to rejuvenate old and neglected plants.
Remember, tree peonies grow rather slowly, producing only a few inches of woody growth each year. So, be patient and avoid pruning in the first couple of years to allow the plant to establish itself.
Tree Peony Care
Tree peonies are a low-maintenance plant, but they do require some care to keep them looking their best. Dead branches and diseased portions should be removed in the spring and fall to promote overall health.
To promote healthy growth, remove any dead wood by cutting back to a healthy bud. You can also cut a few stems back to ground level if you'd like to reduce the size of the tree peony. Leggy stems can be cut back by a third.
Feed your tree peony after the bloom, and consider fertilizing monthly until early fall with flower-inducing sulfate of potash. This will help promote healthy growth and encourage blooming.
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Care Tips
Pruning tree peonies can be a bit tricky, but the key is to trim off the root stock shoots in late winter. This will help you avoid having multiple tree peony varieties growing on the same plant.
To identify the root stock shoots, look for the callus formation and tissue buildup, which can be a giveaway that the shoot is coming from the root stock variety.
Trim off the winter-killed tissue and make flush cuts to prevent disease from infiltrating the plant. This will also help promote healthy growth and prevent the spread of disease.
Tree peonies don't need to be pruned often, but if you want to prune for shape, do it over a few seasons to minimize the impact on the plant. Prune in the spring and/or fall, but be careful not to remove more than a third of the woody portion of the plant in one season.
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Deadheading the spent blossoms is also important, as it will help channel energy towards strong new growth. Make your cuts just above new growth to promote branching and encourage the plant to produce more flowers.
After pruning, feed your tree peony with a general fertilizer, such as fish, blood and bone meal, and consider nourishing it with flower-inducing sulfate of potash monthly until early fall.
Blooms Twice
If you're getting two sets of blooms on your tree peony, one early and one a few weeks later, you have a grafted tree peony.
This is because the herbaceous root stock is flowering after the tree peony branches have flowered, which can cause the herbaceous rootstock to flourish at the expense of the tree peony.
Cut back the herbaceous stems emerging from the base and mulch the plant in deeper to promote the tree peony to form its own roots.
New tree peony branches are multi-branched, so don't cut them back.
Herbaceous shoots emerging from the graft will be single stalks with no branches, making them easy to identify.
If you notice these single-stemmed shoots, take action to prevent the herbaceous rootstock from taking over.
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Common Issues
One common issue with tree peonies is pruning too much of the plant, which can lead to reduced flowering and weakened growth. This is because tree peonies need their foliage to photosynthesize and store energy for the next year's blooms.
Deadheading is crucial for optimal growth, but doing it incorrectly can cause more harm than good. If you're not careful, you might end up cutting off the buds that would have produced flowers the following year.
Pruning issues can be frustrating, but with the right techniques and tips, you can keep your tree peony healthy and thriving.
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Blotch/Red Spot/Measles - Cladosporium
This fungal disease, caused by Cladosporium paeoniae, is a common issue that can impact the health of your peony plant over time.
It's not immediately fatal, but successive years of infection can weaken the plant.
Cut off any diseased portions of the plant to prevent the disease from spreading.
Make sure to dip your pruners in a 10% bleach solution (or use Clorox wipes) between each cut.
Clean up all debris around the plants and throw it away - don't compost it.
Use a fungicide specifically intended for Peony Blotch on peonies, and follow the manufacturer's instructions for application.
Troubleshooting Issues

Troubleshooting issues with your tree peony can be a challenge, but don't worry, I've got some tips to help you out.
Deadheading your peony is crucial for optimal growth, and it's as simple as removing spent flowers after they've bloomed. This will encourage your tree peony to focus its energy on producing new blooms rather than seed production.
Pruning issues can be a real problem, but with the right techniques, you can ensure your tree peony remains healthy and vibrant.
Shaping and Rejuvenation
Shaping your tree peony helps maintain its desired form and aesthetics. By trimming back overgrown branches, you promote a balanced shape that enhances the plant's natural beauty.
Shaping preserves the plant's natural growth habit, keeping it looking its best and supporting its overall health. Focus on preserving the natural growth habit when shaping your tree peony.
Rejuvenation pruning encourages new growth and enhances flowering, especially in older plants. Cutting back a significant portion of the plant, leaving 1-2 feet of healthy stems, is a key part of this technique. The best time for rejuvenation pruning is early spring, just before new growth begins.
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Shaping

Shaping helps maintain the desired form and aesthetics of your tree peony. By trimming back overgrown branches, you promote a balanced shape that enhances the plant's natural beauty.
Tree peonies grow slowly, taking 10+ years to reach full size, with three to four inches of growth each year being common. This slow growth rate makes regular shaping essential to maintain their desired form.
Shaping also helps preserve the plant's natural growth habit, which is crucial for its overall health. By preserving the natural growth habit, you can expect your tree peony to reach its full potential.
Here are the three major shapes of tree peonies, which can guide your shaping efforts:
- Tall/Conical
- Medium/Part Spreading
- Dwarf/Spreading
In cold climates, tree peonies may experience die back, which can affect their shape. However, with proper shaping and care, you can help your tree peony recover and maintain its desired form.
Rejuvenation
Rejuvenation is a powerful technique for giving your plants a fresh start. It involves cutting back a significant portion of the plant, leaving 1-2 feet of healthy stems.

The best time for rejuvenation pruning is early spring, just before new growth begins. This timing maximizes the benefits of your efforts.
Cutting back old stems can encourage more growth and enhance flowering, especially in older plants. This is especially true for peony trees that need a little extra encouragement to bloom.
If your peonies are not blooming, try cutting a few old stems back to ground level to encourage more growth.
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