I heard a nifty solution for this problem from Ted Swensen. Hang large-bulb Christmas lights in the tree, and then when there is a chance of freezing weather, plug them in. The heat will keep the blossoms from freezing. This would also help with late ripening fruit. Now is a great time of year to pick up some lights at a good price.
Steven
Very interesting idea. I've been thinking about this ever since I decided to grow a few pluot trees, despite my better judgement. I was considering builing a plastic tent around them. Money...work...eyesore. But the lights seem like such a coold idea, *if* they work. Very festive too. I think I'll go out and get some and maybe try it on my plum trees next March.. 
The sales person i saw at the nursery yeterday suggested I throw a cloth over the flowering fruit trees should a frost be on the cards. That means we've got to keep a close eye on the weather during the cool months. Another person has told me that a bucket of hot water left by the tree will leave enough humidity in the branches throughout the night to prevent frost from settling. I haven't tried either way but I would like to know too of any other frost proofing methods.
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