I have a cherry tree in my yard, it is full grown. It blooms nice in the spring but rarely produces fruit (not surprising), last year I got 1 cherry! Any way these are sour cherries (VERY sour). Here's my dumb question ~ If I plant 2 sweet cherry trees near it, will they cross pollinate to produce something inbetween that is at least good for making pie filling? Another dumb question~ What should I spray it with and when? (bugs aren't a problem) but I don't know what 'dormant spray' is for really. TIA.