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Since it's still several weeks before we hit our last average frost date, it's a good idea to be prepared to protect the flowers that will provide this summer's fruit. The main thing we can do is to cover the whole tree (if it's not too large) with a tarp or even a big piece of plastic. Normally we don't put plastic on plants because it can burn the edges. But in this case, that may be necessary in order to save our fruit crop. If you can put any kind of heat underneath—like light bulbs or a mechanic's light—that will help a lot.
Caution: Do not wrap the tree up like a lollipop. Spread the cover over it all the way to the ground and secure it, so that heat can rise from the ground up.
Spraying water on the tree is not recommended. Although you can get some protection by continuing to spray water (as if you want to stand outside all night doing that!), you can end up building a large ice load that can shatter the tree or bush. In addition, when the water is turned off, super-cooling actually occurs. Then when the water is turned off super cooling actually occurs.
If you have a variety that insists on blooming too early every year, it may be a better idea to replace it with one that's better geared to the weather in your area. Contact your local Extension Office for a list that's right for you.