We experienced a harsh freeze in Thomaston a week ago, along with all other gardeners in the Northeast. It was more than just unseasonably warm the two weeks before this; it was strange and, to be honest, a little unsettling to have successive days hit 80 degrees in mid-March. It goes without saying that in these circumstances, the peonies truly flourished. We received a lot of inquiries from northern peony producers on the afternoon of 3.26.12 who were concerned about the potential damage the anticipated cold could do to their fecund tree peony buds. For immediate frost protection, we advise covering peonies with a plastic garbage can. It is required to cover larger plants with tarps or row covers that are supported by stakes. We decided to let them confront the weather without any protection because it would be unfair to safeguard some of our several hundred plants while neglecting others. Herbaceous peonies bloom later and are less problematic since even though the stems had appeared, they were still relatively close to the ground.
On the evening of 3.26, the temperature at Cricket Hill fell to 22 degrees. The early season tree peony, which were the most advanced, were all hunched over in what appeared to be hazardous postures the following morning. The Chinese and Japanese Rockii hybrids, which bloomed later, nonetheless had very tight buds and didn’t appear damaged. The tree peony continued to demonstrate to us throughout the day why they are such amazing plants. The stems, leaves, and buds gradually defrosted and righted themselves. We detect no persistent bad effects one week later.
Early in the morning, this specimen of “Phoenix White” appeared somewhat dejected, but by late afternoon, it had totally recovered from all injuries brought on by the cold. Even though there hasn’t been much further growth a week later, the cool temperature is to blame and hasn’t caused any freeze damage.
Customers from the East Coast and the Midwest have informed us that this year’s peony blooms are blooming unusually early. Fellow peony gardeners in Nebraska and Maryland told us this past weekend that their collections are at their pinnacle of bloom. Since our recent week of weather has been thankfully chilly and seasonable, new growth has practically been put on hold. The peony still appear to be two weeks ahead of plan as of right now. To account for this, we have modified our Peony Festival schedule. Of course, these dates are subject to the upcoming weeks’ weather. If the weather continues to be cool for a few more weeks, the bloom may possibly be delayed until mid-May, when it would normally peak.
We have been working cleaning up the garden in order to welcome guests to Peony Heaven. For an excellent lesson on how to get your plants off to a fantastic start for this growing season, have a look at our blog post on spring peony care. Two ‘volunteer’ seed-grown peonies that we discovered while working in the garden should permanently dispel the misconception that peonies are difficult to grow.
Actually, a stone wall is where this tree peony seedling is emerging from. These plants are so hardy and resilient that they can really flourish atop a mountain of rocks. This year, it even has a bloom bud.
This herbaceous peony resembles a seedling of the P. japonica species. This plant that thrives in shade is referred to as a “woodland peony,” which is a fitting moniker for a shrub that grows beneath the dense canopy of numerous red maple trees. About 5′ up the hill from this tiny seedling, our specimen plants of P. japonica can be found. Its germ must have been dropped by the yearly flooding that occurs in this area of the overflowing garden during the intense summer rains. The terrible garlic mustard is a much less welcome unwelcome plant to the right of the peony. Before it blooms, sets seed, and spreads even more, it must be removed!
We’ve seen our first botrytis sightings of the season this week, which I must report with less joy. The recent week’s cool, moist weather has been excellent for the growth of this dangerous fungus. The infection so far appears to be quite small and is only present in a few buds that appear to have suffered winter damage. We will spray Actinovate on our peonies this week to prevent any more illness. We’ve been using this OMRI-certified organic fungicide to manage fungus in the garden for a number of seasons now. If your peonies exhibit symptoms of botrytis, make careful to clean up the garden of any infected plants. To avoid any unintentional additional dissemination, thoroughly disinfect any shears or cutters used in the removal of infected material.
The term “grey mold” refers to the late-stage appearance of botrytis-infected material, which is powdery and grey.
Do peony require freezing protection?
A cold winter is ideal for peonies (Paeonia spp.) to go into dormancy, their seasonal rest. However, peony buds may freeze if they are exposed to a late frost in the spring, shortly before bloom time. If frost is expected, peonies should be covered lightly. However, lack of chilling time is more likely to prevent blossoming than spring frost in mild-winter regions when nonstop days at 45 degrees F or below are uncommon.
What degree of heat should I cover my peony with?
My experience from the previous spring showed me how tough itohs are. You will be alright if you don’t yet notice any blossom buds. The foilage is temperature-resistant. For your comfort, consider this image.
That occurred in March 2014. A tree peony with emerging leaves protrudes through the snow. The plant had a successful year. Itohs are stronger and resemble tree peonies. If the temperature is below 20 degrees and the plant has flower buds, I would cover it. Be remember to remove the cover during the daytime. I wish you luck and hope that this will help you relax.
Will peony suffer in the winter?
We sincerely regret for the delayed post on the Zones 3 and 4 freeze watch/warning tonight due to our extremely busy weekend with our son’s graduation. Our research has shown that three nights with a temperature of 19 degrees Fahrenheit or lower will cause damage to the peony for that particular year. It goes without saying that they returned the next year. For those of you with inquiries about peonies planted in the fall, we advise you to remove the first-year blooms in order to devote all of your stored energy to root development for the next year. How might a late-season frost or cold affect peonies that are still in the bud stage? Unfortunately, that might harm the buds, which would prevent them from flowering, or it could stunt the blossoms. After the colder temperatures tomorrow night and tonight, we’ll know more. The buds may become brown, in which case you should cut them off because they won’t flower. Nearly ten years ago, we witnessed this in the fields, where the two nights of temperatures in the mid to high 20s F destroyed about half of the blooms. The stems and foliage were healthy, but the fragile buds did not suffer as well. Then, the following year, we experienced enormous blooms as the energy was directed toward producing roots, which astounded us to no end. Peonies have incredible tenacity! In household gardens, covering peonies doesn’t do any harm. Will the peony die from the late-season frost or freeze? Evidently, it didn’t in our instance. We ourselves have just let the peonies withstand the elements, even today’s little “sleet” shower. YIKES! Peonies must be loved, right?