Why does the apricot bloom but not set fruit?

Try planting an apricot of a different variety next to it - it often happens that one tree just can't pollinate itself, and even if bees are flying around, it doesn't help much. I know some people who struggled with this problem until they added a pollinator variety, and the next year they got fruit. Of course, frost also plays a role, but if the neighboring trees are fruiting normally, then it's more likely a matter of self-fertility.

Usually it's not the apricot tree itself, but the conditions around it. I'd add to what's already been said about frost and pollination - check your soil moisture in spring when it's flowering. If the ground is too dry after winter, the fruit set will just drop, even if everything else is fine. We dealt with exactly that at our dacha until we started watering in spring before flowering.

I agree with all the reasons mentioned above, but there's one thing people often overlook - if the apricot tree is healthy and conditions are normal, it could just be a simple case of flowering overload from the previous year. The tree spent so much energy on fruit that this season it's blooming heavily, but there's just not enough energy left for the ovaries to develop, so a lot of flowers drop even without frosts or pollination problems.

Also check whether the apricot has any nutritional issues - especially nitrogen and potassium deficiencies in spring. If the tree is depleted or the soil is very poor, it might drop the ovaries simply because it can't support future fruit development. Fertilizing with a balanced fertilizer during flowering and fruit set sometimes works wonders when all other causes have already been ruled out.

Actually, apricots often set fruit just fine, it's just that the fruit drops off at early stages, so it looks like there were no ovaries to begin with. This often happens because the soil lacks potassium and phosphorus - the tree simply can't hold onto the young fruit because it doesn't have the strength. Try feeding your apricot in the fall with a balanced fertilizer that emphasizes these elements, might see results.

Do you usually get rain during the flowering period, or is it dry? Because I noticed at my dacha: the apricot flowers beautifully, but when spring turns out really dry and windy, there's almost no fruit set. The flowers just fall off, like the tree can't hold onto them.

Last year I deliberately watered more heavily during the flowering period - and wouldn't you know it, much more fruit set. On top of what people have already mentioned about pollinators and frost, I'd suggest also keeping an eye on the overall air humidity. If spring is hot and dry, even with bees around it doesn't help much - the flowers just won't stay on the branches.