Late Season Frosts
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Master Gardener℠ volunteers cover tender hydrangeas at the Flat Rock Playhouse Gardens.
The local weather forecast is for one more day of possible frost on Saturday night, May 9, 2020. Every year we advise people to wait until after Mother’s Day to plant summer vegetables but it is so hard to resist planting in April when the temperatures are in the 80s!
Maybe we will not get quite as cold as predicted but if you have tender plants you should cover them up. Water in tender leaves can freeze. This causes plant cells to burst killing the leaves.
Use anything you can find to cover your tender flowers or vegetables such as old flower pots, cloth sheets, burlap, plastic sheets, or even covering low growing plants in straw or mulch. Blueberries, blackberries, raspberries, and strawberries should also be covered. Larger fruit trees such as apples should be ok.
So, what do you look for after that frosty night? On sensitive leaves and stems you will see them turning dark or brown and shriveling. Thin juicy stems might have gotten burned and will die back. Flowers on some plants might have turned brown and fallen off.
What to do? There really is not anything you can do to cure cold damage. You can prune out dead branches and other damaged plant parts but that is about it. Remember, it never hurts to fertilize your trees, shrubs, perennial and annual flowers, etc. The fertilizer will boost plant growth and new plant parts will grow into the damaged area. Eventually lopsided plants will balance themselves.
The top of this Japanese Maple was damaged in a late-season frost.