I was was wondering if a fruiting apple tree and a pear tree will still blossom even if they don't get enough chilling hours? ( growing them from seeds. ) I'm living in Los Angeles and we don't really go below 45 degrees for too long at night. So I am more interested in the flowering than the fruiting itself.
I think what happens is the whole tree fails to break bud in spring. http://homeorchard.ucdavis.edu/general-tree.html
You would likely need to look at the tropical-adapted varieties, rather than stock grown from commecial seeds. Ron is absolutely right - in general, without enough chill hours apples and pears don't even set leaves after their first year, let alone blossoms or fruit. I had this exact problem trying to grow Bartlett pears in Ecuador, before I discovered the adapted varieties. If you'd like, I can send you tropical-adapted pear seeds (as I live in Ambato, Ecuador, one of the few tropical locations where pears are grown commercially; the closest we get to chill hours is about 8 C / 48 F) - send me a PM if you're interested in a trade. The fruit are quite a bit smaller than temperate pears, but the blossoms, which it sounds like you're after anyway, are fantastic. Apples are slightly harder; however, the tropical-adapted plums and apricot-like fruits are also good bloomers (particularly the furry stonefruit known as "durazno" which has vibrant pink blossoms, and produces a fruit that is a cross in flavour between peaches and apricots.)
