|Gravenstein is the first apple to bloom. 4.19.17|
None of the others in my yard are open, although there are some buds that look close.
Of the plums, virtually all of the Asian and Asian x American hybrids are done blooming. Ember is winding down. I have what I think is Prunus americana, but might not be, grown from seeds. That one is just starting. I don't think it will do much good as a pollen source if it waits until the others are done blooming, before it starts.
Green Gage Plum is a little past peak bloom, and Stanley Plum is at peak bloom. They may boost each other by cross pollinating, although both is considered self pollinating. My other European plums probably wont bloom for a couple of years, so time will tell. Or not.