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Old April 19, 2021   #1
D.J. Wolf
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Default Frost/Freeze

Ok, I'm getting abit concerned here and don't know what to do. Hope someone can help me if the situation can be helped.

So, the question first. Just how cold of temperatures can apple and peach tree's stand when in full blossom without losing the crop?

Reason for asking...my yard has 2 apple trees and at least 4 peach trees that this year are just loaded with blossoms. In the year and a half I've lived here, I haven't had a single peach, and the only apples where when I moved in in October of 2019. They were still on the tree and still really good, but I didn't get them picked like I should have due to just having moved in and other stuff taking priority.

Is there anything at all I can do to protect them this week? Other than pray that the weather service has it all wrong? Forecast is calling for 27 Tuesday night and 29 Wednesday night
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Old April 19, 2021   #2
VirginiaClay
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According to a Penn State extension service chart, you'll lose 10% of your (unprotected) apple blossoms if it gets down to 28 degrees for 30 minutes, and 90% if it gets down to 25 degrees for 30 minutes. The chart says peach blossoms are one degree hardier. The amount of loss is going to depend on blossom stage and the siting of your trees.

Virginia used to be a big apple-growing state, and I remember years with news stories showing us how the orchards were trying to protect their crops when we'd get a late freeze. They did two main things: put smudge pots in the orchards (55-gallon drums with something burning in them), and spray the trees with water to coat them with ice. Would either of those methods be possible on your property? Obviously fire is dangerous, so I'm not recommending that one unless you make a habit of burning things and know what you're doing.

If the trees are small, you can cover them with blankets or tarps (non-plastic), preferably on a frame that keeps the material off the blossoms. If possible, you can put holiday lights or regular light bulbs in the trees to add some warmth, but they have to be incandescent or halogen, not LED. I'm guessing this is only feasible if the trees are fairly small.

Another option is to fill large containers with heated water (or let the sun heat the water) and put them under the trees. Apparently it's also helpful to water the trees (meaning, the ground around them) before the freeze, because that will help warmth radiate from the soil.

Good luck; I hope your blossoms make it through the cold snap and you get some fruit this year!
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Old April 19, 2021   #3
brownrexx
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Some people also use large fans to keep the frost from settling on the trees.
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Old April 19, 2021   #4
D.J. Wolf
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I guess my best hope is going to be that it rains enough to have things wet and forms ice on the blossoms instead of freezing them lol. I don't think the city would appreciate me trying to do smudge pots or burning things all night. These are big mature trees too, so covering them isn't an option. That said, at those temperatures, I might take a 10-20% hit, I can accept that.
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