I have an Elstar apple tree that I got at the UBC Applefest about 5 years ago. Last year it produced 50 or 60 absolutely delicious apples. This year it did not produce any, causing me to search the web and discover (a) that some types of apple trees produce fruit every second year and (b) that Elstar is one of them. No problem - I will simply get another alternate-year producing tree, one that produces apples in years when my Elstar does not. My question is: how can I identify such a tree? If I just buy some other tree that is said to bear fruit in alternate years, it seems to me that my chances are 50% that it will produce apples in years when my Elstar does not, which is what I want - and 50% that it will be exactly synchronized with my current tree, giving me alternate years of feast and famine, which I certainly do not want.