What to Do When Your Garden Freezes

The weather has been crazy this month. The temperature this afternoon was 84 degrees. Just last week, we reached a record low for November 14 in Macon: 21 degrees.

Fortunately, I was prepared for the freeze. My husband and I bought more sturdy supplies to cover the vegetable garden. (Our last cover involved bamboo stakes and duct tape.) We created a frame using two 10-foot, 1/2"-diameter PVC pipes and covered it with a 6 mm-thick plastic drop cloth. It didn't keep the summer vegetables (or zinnias) from meeting their inevitable demise, but the fall vegetables were quite happy with the arrangement.

My vegetable garden with PVC framing
for cold protection the day after the first
freeze

The freeze killed all the peppers.

The fall vegetables are loving the cooler temperatures.
Clockwise from top left: onions, lettuce, radish, and
cauliflower

 As for the rest of my garden, the ornamentals had a mixed response. Growing up in south Florida, temperatures just don't ever get to 21 degrees, so I still look at freezing temperatures like a fun science experiment. Like any good science experiment, I carefully documented the results. My hydrangeas looked dead the next day. Fortunately, I know they're cold hardy, so I expect they'll look fine come spring. My hostas also took the cue to start winding down for the winter. My roses didn't notice the difference. Both the rose blooms and leaves looked exactly the same as they had the day before. The pansies, too, were unfazed by the cold.

The hydrangea leaves wilted and blackened from the
freeze. The roses and pansies were unaffected.

With some plants still thriving and others dying back for the winter, you may wonder what you should be doing right now in your garden. The combination of sudden cold snaps and surprisingly warm weather confuses plants and people alike. Here are a few tips for caring for your plants in November:

1. Resist the urge to prune shrubs. You might want to jump in and trim back your pathetic-looking hydrangeas (or other shrubs), but the best thing you can do is leave them alone. Pruning signals to plants that they should branch out, and especially in the warmer weather they are likely to put out a bunch of new growth. Even if a plant is cold-hardy, all that tender new growth will be easily damaged when the next freeze hits. Wait until late in winter, when the plants are good and dormant, to do most of your pruning.

2. Resist the urge to fertilize...almost everything. Just like with pruning, fertilizing encourages tender new growth, which can be damaged by a freeze. Your plants need to be sleeping, not growing. Here in zone 8, we have some exceptions. All of your winter annuals, such as pansies, snapdragons, and ornamental kale, should be kept on a regular feeding schedule to maximize their blooms. They will continue growing quite happily through the winter. Your cold weather vegetables, too, can be fertilized as needed.

3. Plant or transplant shrubs. This is a good time to plant roses, blueberries, azaleas, and other shrubs. The cooler weather gives the roots plenty of time to get established before the summer heat hits. (Even when plants are bare and dormant, their roots are still growing.) This is also a good time to move plants to a new location. One of my hydrangeas looked unhappy every afternoon this summer, so I'll probably dig it up and move it to a shadier location in the next couple of weeks.

4. Keep watering. Just because plants are dormant doesn't mean they don't need water. The harsh wind, especially, can dry plants out fast. They don't need to be watered as often as they do in the summer, but if we go through a dry spell, throw a little water on your sleeping shrubs. If you just planted shrubs, they need  frequent water. If your pansies look wilted after a freeze, throw some water on them and they'll perk right up.

5. Rake leaves. As I mentioned in my post on fungus, fallen leaves make the perfect place for plant diseases to hibernate until they return in the winter. For the health of your plants, you should rake up the leaves and either compost them or haul them to the curb.

Happy gardening!