If you grow peonies, October is not a throwaway month. It’s the month that quietly decides whether you’ll get a few polite flowers next spring or those big, lush, dinner-plate blooms that make neighbors slow down at the curb. In my part of the Midwest, I’ve learned that peonies do most of their important “behind the scenes” work when the garden looks like it’s winding down. While the tops are fading, the roots are still busy storing energy, settling in, and preparing next year’s buds.

Over the years, I’ve made just about every peony mistake a home gardener can make—planting too deep, feeding at the wrong time, letting diseased foliage linger too long, and crowding plants that needed breathing room. The good news is that peonies are wonderfully forgiving if you give them what they need in fall. Here are the most important jobs I tackle in October to feed peonies properly, strengthen their root systems, and set them up for a spectacular spring show.

1. Water deeply if October is dry

A lot of gardeners stop watering peonies once summer is over, but October moisture matters more than many people realize. Peonies are building and maintaining roots in cool fall soil, and dry ground can slow that work down. If your area has received less than 1 inch of rain in a week, give established peonies a slow, deep soaking.

I aim for about 2 to 3 gallons of water for a mature plant once a week during a dry stretch, applied slowly at the base rather than sprayed over the foliage. Newly planted peonies need even closer attention and may need water every 5 to 7 days if the soil is sandy and daytime temperatures are still above 60 degrees. The goal is moist soil 6 to 8 inches down, never soggy, because waterlogged roots are just as problematic as dry ones.

2. Pull weeds and clear the root zone

Before I feed peonies, I always clear a clean circle around each plant. Weeds compete for moisture and nutrients, and in fall that competition robs the roots right when they should be storing energy. Remove grass, chickweed, creeping charlie, and any volunteer seedlings from at least 12 to 18 inches around the crown.

I do this by hand instead of chopping around with a hoe, because peony roots and eyes can sit closer to the surface than people expect. If the soil is firm, a hand fork works better than a full-size shovel. This little cleanup also improves air circulation and makes it easier to spot rot, insect damage, or signs that the plant was set too deep.

3. Cut back foliage at the right time—not too early

One of the biggest fall mistakes is cutting peonies down while the leaves are still mostly green. Those leaves are still feeding the plant. I wait until after a hard frost or until the foliage has turned yellow, brown, or collapsed naturally. In many Midwestern gardens, that’s sometime from mid-October to early November, depending on the year.

Once the foliage is done, cut stems down to about 1 to 2 inches above soil level using clean pruners. If the leaves showed any spotting, mildew, or blotches during the season, bag and throw the debris away rather than composting it. Good sanitation matters with peonies because fungal issues like botrytis can overwinter in old stems and leaves.

4. Feed lightly with a low-nitrogen fertilizer

October is a good time to give peonies a modest feeding, but this is not the moment for a high-nitrogen lawn fertilizer. Too much nitrogen encourages leafy growth instead of sturdy roots and flower production. I use a balanced or low-nitrogen product such as 5-10-10 or 10-10-10, applying about 1/4 to 1/2 cup around a mature plant, depending on the label directions.

Keep fertilizer 6 inches away from the crown and scratch it lightly into the top inch of soil. Don’t pile it directly over the eyes. Then water it in well. If your soil is already rich, stay on the lighter side. Peonies are not heavy feeders, and overdoing it can actually reduce flowering. For young plants in their first year, I’m especially cautious and often use just a small handful around the drip line.

5. Add compost, but keep it away from the crown

Compost is one of my favorite gentle ways to feed peonies in fall. A 1- to 2-inch layer of finished compost spread around the plant improves soil structure, supports microbial life, and releases nutrients gradually. The key is placement: keep compost a couple of inches back from the crown so you don’t accidentally bury the eyes too deeply.

Peonies bloom best when their eyes sit only about 1 to 2 inches below the soil surface in cold-winter climates. Any yearly habit of mounding mulch, compost, or soil directly over the center can slowly push them too deep, and that often leads to plenty of leaves but few flowers. I spread compost in a wide ring, not a volcano shape, and let winter moisture carry nutrients downward.

6. Check planting depth and correct it if needed

If your peony has been healthy but stingy with blooms for 2 or 3 years, depth is one of the first things to investigate. Gently brush away soil near the crown and look for the pink or whitish buds, often called eyes. In most northern and Midwestern gardens, those eyes should be no more than 1 to 2 inches below the soil line.

If they’re buried 3 or 4 inches deep, the plant may need lifting and resetting. October is one of the best times to do that. Dig wide—at least 10 to 12 inches out from the crown—because peony roots are fleshy and brittle. Replant so the eyes sit at the proper depth, then water thoroughly. It may take a year to fully settle in again, but proper depth is one of the biggest predictors of strong spring blooming.

7. Divide crowded peonies only if they truly need it

Peonies do not need frequent dividing the way some perennials do. In fact, many plants bloom best when left undisturbed for years. But if a clump is 10 or more years old, producing smaller flowers, or obviously overcrowded, October is the right window to divide it in many climates.

After cutting back the foliage, dig the plant carefully and wash or shake off enough soil to see the root structure. Use a clean knife to divide sections so each piece has 3 to 5 eyes and several thick storage roots, ideally 4 to 6 inches long. Smaller divisions can survive, but they usually take longer to rebound. Replant immediately, spacing divisions about 3 feet apart so mature plants have room for airflow and future growth.

8. Mulch wisely after the ground cools

This is where I see a lot of confusion. Peonies appreciate winter protection in colder zones, but they do not like being smothered. If you’ve just planted or divided a peony this fall, add a light winter mulch after the ground begins to freeze or after nighttime temperatures have consistently dropped below about 28 to 30 degrees.

Use a loose 2- to 3-inch layer of straw, shredded leaves, or pine needles over the surrounding soil, not packed tightly over the crown. For established peonies, heavy mulch is often unnecessary unless you garden in a very cold, exposed spot. In spring, remove that protective layer early, as soon as severe freeze-thaw swings have passed. Leaving mulch too long can keep the crown too damp and too deep.

9. Remove diseased material and sanitize tools

If your peonies struggled with leaf spot, botrytis blight, blackened stems, or powdery mildew this year, October cleanup is one of the best things you can do for next season. Gather every fallen leaf and stem piece from around the plant. Even small bits can harbor fungal spores through winter.

After pruning, I wipe my pruners with rubbing alcohol or a disinfecting solution before moving to the next plant. It’s a simple step, but it helps avoid spreading problems around the garden. I also make a mental note of which plants had trouble, because next spring those are the ones I watch first when the weather turns cool and wet.

10. Improve drainage if water stands in winter

Peonies want moisture, but they absolutely hate sitting in heavy, wet soil for long periods. If you notice puddles around them after fall rains or snowmelt, fix that before winter settles in. Root and crown rot are far more likely in poorly drained beds than in slightly dry ones.

For mild drainage issues, work compost into the surrounding soil area—not directly through the crown—and create a slightly raised planting zone 2 to 4 inches higher than the surrounding bed. In tougher clay soil, I’ve had better luck relocating peonies to a bed amended deeply over a broad area rather than digging one soft “bathtub” hole. If water routinely stands for more than 24 hours, drainage needs attention.

11. Mark the plant location before winter

This may sound small, but it saves a lot of spring heartbreak. Once peonies are cut back, it becomes surprisingly easy to forget exactly where the crown sits. I place a short plant marker or a small ring of three stakes around the area so I don’t accidentally dig into it while planting tulips, edging the bed, or setting out early spring annuals.

Peony eyes can be damaged by one enthusiastic shovel jab. If you garden with kids or grandkids, a simple marker also helps everyone know where not to step when the bed looks bare. In my yard, this one habit has prevented more accidental damage than any fancy garden gadget ever has.

12. Be patient with new transplants

If you planted, moved, or divided peonies this fall, don’t expect instant perfection next spring. Healthy root establishment comes first. Some new divisions bloom lightly in their first spring, some produce just a few stems, and some skip flowering while they settle in. That doesn’t mean you did anything wrong.

What matters is giving them steady moisture before freeze-up, proper planting depth, and a sunny location with at least 6 hours of direct sun a day. By year 2 and especially year 3, most well-planted peonies begin to show what they can really do. I always tell newer gardeners the same thing I tell my own family at the dinner table when something good is baking: don’t keep opening the oven door. Let the process work.