What cause babe-in-arms oranges to topple rotten? I live contained by northern California?

Every spring I get lots of blossums and when the oranges are around 1/2 inch they all slump off.

Answers: .Citrus trees usually drop over 95% of the flowers and will singular keep the fruit that it can support. There are 2 basic drop periods, one right after bloom and one contained by June (called June drop, but somtimes it is late May).
..total drop can stingy the tree is starving (they are extraordinarily heavy feeders and obligation fertilizers and minerals) and a steady amount of water.

see also:
http://www.ubcbotanicalgarden.org/forums...
http://www.ubcbotanicalgarden.org/forums...
http://en.allexperts.com/q/House-Plants-...
http://www.hgtv.com/hgtv/gl_plants_fruit...

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