Since the tree has thrived at an elevation of about 2,000 feet for longer than anyone living in this neighborhood can remember, it must be a pretty cold-hardy variety. But a deep freeze at blossom time really threatens to thin the crop. So we called Bob Rulf, who owns Rulf’s Orchards, in Peru. He said it wouldn’t be such a bad idea to light charcoal in a couple of grills beneath the tree (this is a pretty big tree) and keep the smoke rising. Between 4 a.m. and 8 a.m. is the coldest part of the night, Rulf said.
The temperature is only supposed to get down to about 29 degrees in Peru, the more-temperate apple basket of the Adirondacks. Cornell Cooperative Extension advises that when an apple blossom is tight and in the pink it can stand 30 degrees F for an hour; when it’s wide-open white it can stand 28 degrees for an hour, which seems counterintuitive, Rulf said.
His orchard is not equipped with wind machines or any large-scale equipment for dealing with frosts, so he’ll take his chances with the apples. However Rulf does plan to tow a furnace around the strawberry patch tonight with helpers riding along to blow hot air on that crop.
Photograph: Our apple tree in bloom