In Part 1 I mentioned the two hard frosts and a freeze we had recently, all of them rather later in the season than is typical. I illustrated how different species in the same genus reacted to the freeze differently, and also gave examples of plants that were damaged even though they were protected.
Appearances Can Be Deceiving
Sometimes frost damage doesn’t show up right away.
The Forever&Ever hydrangeas are a special form of Hydrangea macrophylla. The leaves put out new growth early, but that growth is frost sensitive. In our cold climate, the buds that produce flowers must be protected from freezing. I mostly do this with a thick covering of leaves, but this shrub was putting out growth beyond the leaves piled around it. I covered this growth with a container, which was sufficient for the first two heavy frosts, but not the big freeze.On the other hand…
Too Big to Protect
Trees and shrubs often take the worst hits from unexpectedly cold weather because they can’t be covered. We are always dreading frost when the apple trees are blooming, and this Michigan State University Extension site explains how to assess frost damage to apple buds, flowers, fruit and trees. The photo below illustrates how woody plants can vary in their resistance to cold damage.
We gathered several bouquets of lilacs the night before, certain they would all be reduced to brown mush.Some Plants Can Take It
What You Should Learn From This
When the forecast reads,
Temperatures Monday morning will fall into the upper 20s to lower 30s. Sheltered rural valleys could be even colder…Those with agricultural or gardening interests in the warned area are advised to protect tender vegetation.
don’t throw your hands up in despair. Even if you can’t completely protect your plants, you can help many of them either to recover for this season, or to build up strength for next season. You won’t know how much you can save until after it’s all over, so don’t assume it’s hopeless ahead of time.
I have a Schubert Chokecherry tree and it started to bud out in March during a warm spell but since then we have had some very cold and wintery days in April and May. The buds are very small and seem to have been stunted. Will this tree get buds, leaves or flowers this year? Will this kill the tree?
My guess (and it’s only a guess) is that you won’t get flowers, but you will get leaves. And of course, no flowers means no fruit. It shouldn’t kill the tree unless it was already stressed by something else (disease, root compaction, drought, etc.).
i started my dahlias indoors, then because it was so nice i pleeanted them outside, big mistake, yylost to frost, cut foilage all off, .will they come back
They might. What have you got to lose?
I covered my new spring planted endless summer hydrangea with dead leaves in the fall. This Spring, after removing the leaves close to the base of the plant, I pruned it back quite low to promote a bushy plant. It started to grow beautifully, but then the threat of frosts came.[Big surprise]. Icovered the plant both nights with two layers of sheets and fortunately, it was not harmed. It is now the size it was before I pruned it![May25]. I am new to growing this hydrangea, so I am thrilled it is doing so well. My only complaint is that it soakes up water like a sponge, and I am forever watering it as soon as it shows the first sign of a wilt. I should also mention that I fertilized it twice with Miracle Grow for acid loving plants. I am keeping my fingers crossed that it continues to do well this summer. I hope this helps someone new to growing these beautiful plants as I am.
Spring can be tricky for our plant friends, when snow storms attach us in late April even many plants are damaged t physical as wll as phsiological.
I think these special macrophyllas are never going to be completely successful up here. I protect mine with shrub coat, but I honestly don’t know what difference it makes.
We had much the same results here Kathy – this has been a spectacular year for lilacs and the freezes didn’t faze them a bit. Our entire property is still littered with little “burned” tips of choke cherry and ash branches. I am not expecting my astibles to bloom because of how damaged the ends are and I will have to cut off some hosta leaves, but other than that, so far everthing looks fine. We covered the veggies with planks and straw, and I brought in all of the annuals, but I didn’t cover anything else. Daylilies can typically deal with a frost, but we will have to see if the blooms suffer. On the plus side all the bamboo was killed back nearly to the ground – coming back now but it will not get nearly as bothersome this year. Sumac also is just stating to leaf out again – some people don’t like sumac, but I think it’s pretty so we just confine it to a few spots. We will have to comapre notes later on to see how things do the rest of the season.
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My sympathy and empathy to you. After being in the business for more time than I care to remember, I know which plants we have to watch out for in the spring. March is our bad month but sometimes early April can be surprising. What to drag in or cover, what to leave out always the burning questions in changing weather.
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Kathy, These are dramatic illustrations of dramatic weather conditions. But even the long, too-cool spring has had a negative impact in my USDA Zone 5 garden. Tender perennials such as coleus, for instance, seem in a state of arrested time-warp. One of them hasn’t moved an inch since planting a couple of weeks ago. I’d have been wiser to keep it indoors. However, who knew? This has been a wacky spring (frost warnings overnight last night in the greater Toronto region; the morning of June 1st!).
Sorry about your hydrangea. Hope it rebounds for you.
This is all so fascinating! I can’t believe how dramatic a change the Hydrangea undergoes. I tried to protect some of the buds of my Cladrastis kentukea, but they still got zapped. The weird thing is that some unprotected buds appear to be ok. It will be interesting to see if it blooms at all this year.
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Wow! Those before and afters of Hydrangea and Columbine are very dramatic, Kathy.
Some of my worst cold damage this year didn’t come from cold air, but from the hail storm at the end of March. The damage didn’t show up right away either, but in addition to leaf & branch breakage or chipping, many plants turned out to resent having a couple of inches of hailstones sitting on them for several hours. Some showed freeze damage or stopped growing for weeks, others died quickly. It’s surprising how some plants can look so frail and be so tough.
Annie at the Transplantable Rose
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