After an herbaceous peony finishes flowering, you can remove the spent heads and fallen petals. Leave healthy green leaves to build reserves for the next season. Check the soil for moisture, support any sound stems leaning over the path and look for spots after wet weather. Make these decisions for each plant. The date a neighbouring peony finished tells you little about the one that still has buds.
What to remove once the last flower fades
Start with individual flowers that have already faded. If you are not saving seed, cut off a spent head above the next healthy leaf. Keep the green stem and any side buds. These buds are easy to overlook in a thick clump. Lift the spent flower, look below it and choose where to cut. Avoid pulling at petals stuck together after rain.
Removing the heads is especially handy where heavy spent flowers are making stems lean. If seed pods have already formed, you can remove them later while keeping the leaves. To grow peonies from seed, mark a few selected pods and let them mature. The resulting plants may differ from the parent cultivar. Deadheading an herbaceous peony also gives you no reason to expect a new flush of flowers that summer.
After taking off the heads, look at the shape of the clump. If a whole stem has leaned onto the path and feels firm, lift it with a ring support or a soft, loose tie. Assess a broken stem separately. See the peony pruning guide for cuts and autumn cleanup. The priority after flowering is to keep as much healthy green growth as possible.
How to decide if the peony needs water
Reach under the leaves and feel the soil near the edge of the clump without digging into roots. A dry-looking crust after wind may cover damp soil. Likewise, a shower that wetted the path may not have reached far below dense foliage. Compare soil moisture in two spots beneath the plant. If the root zone is dry and hot weather is continuing, apply water slowly to the ground. If the soil below the surface is still moist, check it again before watering.
Conditions can change more quickly in an open sunny bed with light soil than in a partly shaded border on heavier ground. After a downpour, look at where water from a roof or path collects. Adding water to a wet hollow prolongs the standing moisture. On a dry slope where water runs off, apply it more slowly and pause to let it soak in. Check how each plant's soil changes before setting a routine for the whole bed.
Place a hose where it will not snag a ring support or bend the stems. After watering, check the edge of the dry patch that the stream previously missed. Adjust where you deliver the water next time if that part still needs it.
How to conserve moisture around the clump
Pull weeds that crowd the lower leaves or make inspection difficult. If you use mulch, spread it over the area you water and leave room around the base of the stems. Avoid piling fresh soil over the crown. Eyes buried too deeply can affect flowering. After watering, check that the water reaches the soil and stems are clear. After rain, notice how long the lower leaves remain wet.
Consider two neighbouring clumps. One is beside a stone path in full sun, and the other gets shade during part of the day. After a windy week both surfaces look dry. Below the crust, the first may be dry and the second may still be cool and moist. Water the one that needs it. At later checks, compare which patch holds moisture for longer and whether the stems remain firm.
How to respond to spots, wilting and discolouration
Assess faded flowers separately from other symptoms. Petals that dry after flowering do not account for a dark mark at the base of a stem. Check whether the mark is isolated or whether other leaves and stems are affected. After cool rainy days, look for softened or blackened areas and grey fuzzy growth. These can signal disease. The appearance of one spot is insufficient to identify a pathogen.
Remove affected parts that can be taken off without cutting down the whole green clump. Keep them out from beneath the plant. Avoid carrying wet debris across other peonies, and clean your tools after handling affected parts. If an entire stem wilts rapidly or damage develops on several plants, take a photo and seek help identifying the cause. Also check for standing water and lack of airflow between plants.
What to look for after heavy rain
Compare stems at the edge and in the centre of the clump, then inspect the plant next to it. Note whether spots are limited to places that held wet petals. Photograph the unaffected leaves as well so you can see where the damage starts. Once dry weather returns, compare the plant with that photo. New spots where no petals lay need a closer look. A change that starts on the flower, leaf or stem base can call for different follow-up.
What to leave in place for the rest of the season
While foliage remains green, the peony still has a place in the border. Note where neighbouring plants shade it or where a support would help next year. Give a recently planted or divided clump time to establish. The end of flowering gives you no reason by itself to move a peony. Wait for autumn dieback before cutting back the whole herbaceous clump. Keep the permanent woody framework of a tree peony.
In a Ukrainian garden with early and late cultivars, post-flowering tasks may take place at different times even in neighbouring beds. Start with the clumps that have finished and mark the others for a later check. At the end of the season, compare what you observed with the spring-to-autumn care guide for herbaceous peonies. Notes on lost light, standing water and leaning stems give you something specific to address next spring.
Consider nutrition separately. Think about what you have already applied, how well the clump grows and what the soil assessment shows. Address standing water or strong shade first. A clump with vigorous healthy leaves also needs a reason before you add fertilizer. Make a note of any test results and the stage when the chosen product is intended for use.
Planning peony nutrition for next spring
Complex fertilizer for peonies, granules
If the soil assessment and the condition of an established bed show a nutrient need for next spring, consider DÜNGER peony granules. The full directions include early spring and before-flowering applications. At an applicable stage, the granules are scattered on soil around the plant. Watering and keeping green leaves after bloom are separate decisions.
Packs come in 0.5 and 1 kg. Before ordering, measure the area that actually needs feeding and check the complete directions, pack sizes and price on the product page.
Frequently asked questions
Keep healthy green stems and leaves. You can remove spent heads and isolated affected parts. Cut back an herbaceous clump after autumn dieback. Tree peonies retain their woody stems.
Check whether the stems are intact. Sound stems can be held up by a support that leaves them room. If it happens each year, set up a support while the stems are still upright next spring.
Check the soil under the leaves first. If it is damp near the roots, wait. If a brief shower left the root zone dry and more hot weather is expected, water slowly and check that it soaks in.
