I live in Southern California Zone 10a. I have a plum tree which I've now had for 3 years and it was a 24" box tree when I got it. The tree is a Santa Rosa plum which is self fertile. The first 2 years I had it I had one plum each year. This year the blossom has now gone and I can't see any baby plums at all. I fertilize it twice a year (organic fertilizer) and last year I gave it a couple inches of compost and some gypsum as our soil here has clay. I will add the compost again this year just haven't got around to it. It gets watered once a week.

Do you think the tree is just too young to produce fruit? Or is there something I should be doing?