Mostly luck I guess. Last year all the flowers dried out and I didn't get a single fruit. I spray my trees pretty frequently with all sort of concoctions. Not necessarily all at once, but I'll spray with micros, kelp, neem oil, copper, sulfur, and some other stuff like 'ripe blend' (kelp4less). Also mix in copper/sulfur depending on time of season. My trees definitely look nice and healthy.
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I definitely need a consultation from you. When to spray copper, sulfur and in what form and how often. i try to keep everything organic as possible. And what is ripe4less?