Q.Premature Mulberry
Last year I grew some mulberry cuttings all these produced were leaf every few inches. July I pruned them back. Around first of August four sections started to produce flowers then Berries. 5 days ago four just fell off and today 5 fell. Watering is good, could be weather. It’s been unusually hot here in San Diego.

GKH_Susan
Certified GKH Gardening Expert
Certified GKH Gardening Expert
Answered on September 21, 2022
There are several possibilities including weather, poor pollination, overbearing, and insects. Here is more:
https://www.gardeningknowhow.com/ornamental/trees/fruitless-mulberry/mulberry-fruit-drop.htm
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