Hello all I got a bonanza peach from the Portland nursery back in March it flowered the gave way to small peaches, I thinned it down to 3 peaches last week after they reached over 1 in diameter as I didn't want my young tree to work so hard producing fruit its first year. I went out to check on it this morning and I dropped one of the peaches. I now have two left that are approx. 1 in in diameter. I bough EB stones citrus and fruit fertilizer 7-3-3 at the recommendation of the nursery who knew I was keeping it in its container, I've since learned that organic fertilizer doesn't work for potted trees and haven't fed it. My question is this an early June drop or because I haven't fed it? Also what kind of fertilizer should I be using and at what frequency/rate? Is it too late to fertilize now? My assumption is that they would need more food while producing fruit but as this is my first fruit tree I need all the help I can get!

I'm zone 8A Portland Oregon

Thank you