How to Care for Tree Peonies

The tree peony, a type of shrub known for its large fragrant flowers, can grow up to 5 feet tall. The flowers may be double, semi-double or single in just about any color except blue. Though tree peonies are expensive and grow slowly, just one tree peony can provide many years of beautiful flowers. In fact, a tree peony may live for up to 100 years. Tree peonies are relatively easy to care for, but a few pointers will help ensure you get maximum enjoyment from the shrubs.

Instructions

1. Plant tree peonies in the fall in a well-drained area. Soil with a pH of 6.5 to 7 is ideal for peonies so add some lime to your soil if you need to raise the pH level. Position the plant with the graft union several inches below ground level. Pack the soil well around the roots and create a mound of soil around the stem for the first winter.

2. Water tree peonies well when you plant them. Then water them every 10 to 14 days throughout the first fall. Once a tree peony is established, water regularly in hot weather but don't allow the soil to get too wet.

3. Feed the peonies in the spring. Use a complete, low-nitrogen fertilizer, either a 5-10-5 or a 5-10-10, and apply it at a rate of two and a half pounds per 100 square feet. Do not allow the fertilizer to come in contact with the shrub. You may also use well-aged manure to enrich the soil if needed. Place a one-inch layer near the shrub, again avoiding contact with the plant.

4. Have patience. Tree peonies will begin blooming by the third year. As the years go by, the tree peony's flowers will increase in size as well as quantity. Bosoms appear in the spring, some time between March and May.

5. Remove the seed heads after tree peonies flower. This will enable the shrubs to store energy for the next year's flowers.

Tips & Warnings

• Tree peonies with large flowers will keep their flowers longer if they are shaded during the hottest part of the day. Shelter from the wind will also protect the blooms.

• If you wish to cut peonies for display, take them in the soft bud stage, when the buds are as soft as marshmallows.

• Do not cut down tree peonies in the fall. Unlike garden peonies, they are shrubs that will not grow back when cut.

References

• Clemson University Extension
• Washington State University