Frost Proofing My Outdoor Citrus Plants With Liquid Frost Cloth
Hello friends,
Autumn is here, and the Autumn equinox has just been, and so with it comes the increased risk of frosts. The earliest frost we've had at our home since I started keeping records was on the 6th of April 2019, which is only 17 days away from today's date. All it takes is one cold front to come through, followed by a cold clear night, and a frost is possible. We've already had a low temperature of 3˚C this month, so there's definitely now a risk to my frost tender plants.
Our citrus plants outgrew their pots in spring last year, so they can no longer sit inside the glasshouse over winter for protection. I planted them in the patio in October 2023, so they now need to be protected from frosts and snow over the coming autumn and winters.
I plan to do this in a number of ways. The first one, which I've just done, is to treat all my citrus plants with liquid frost cloth, which is called Vapor Guard in NZ (you can buy this from garden centers). It protects plants down to -3˚C frosts by forming a protective wax coating over the leaves. Vapor Guard lasts about 6 weeks, as rain and frosts slowly break down the protective wax coating, and then it's time to spray Vapor Guard all over again. I keep a note of the dates I spray in my garden diary, and also calculate the next spraying day six weeks from then.
Vapor Guard does not protect the plants below -3˚C, so frost cloth is needed to protect the plants during the colder parts of the year. My plan over the next month is to build wooden frames, and then to attach frost cloth over the top. I'll then move the frames daily into position to protect the citrus plants when needed.
To treat the citrus plants with liquid frost cloth I added 15 mL of Vapor Guard to 1L of luke warm water. After giving it a good mix, I sprayed the liquid frost cloth onto the plant leaves on a dry and warm sunny morning with no wind. I wore gloves and a mask while doing so. The 1L of liquid frost cloth spray was enough to spray my lemon, mandarin, and lime plants, and also enough left over to protect my Camellia sinensis (tea plant) too.
My plants then had the rest of the day to dry, and for the wax to set. They're now protected from frosts for the next 6 weeks, we don't usually get heavy frosts until late May/early June, so I now have time to build the protective frost cloth cages.
I'm relieved to have done this, as the last week has been quite rainy, which meant I couldn't get a window to get this garden job done.
There will be no blog post next week, as hubby and I are having a much needed staycation between Otago Anniversary Day and Easter. Well be relaxing and eating hot cross buns and chocolate, and I hope to make strawberry and raspberry jam as well. I'll post again in early April.
Have a wonderful day
Julie-Ann
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