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Official Blog of the UC Master Gardener Program of Contra Costa County
by William Hurt
on February 5, 2019 at 2:27 PM
I have a valentia orange planted next to a bitter orange. Until this year the valentia orange has been sweet and amazing. This year the fruit looks like the bitter fruit next to it. On the oposite side of the Velentia tree from the bitter tree, the oranges a small, but not as bitter. They are still not as good as previous years. Any ideas?
Reply by Steve I Morse
on February 11, 2019 at 4:02 PM
I'm the editor of the blog....  
I believe the answer is already in the blog... primarily that you've now got another "sour" orange tree... see especially "Rootstock Takeover" ... my personal experience of this occurred when I had several citrus still in 5 gall can over a very cold winter that basically killed some branches on the tree and new growth came from below the graft and that branch provided very few and those small fruit growth were very sour... I invited a friend over to look at the tree... he was something of a citrus junkie... and long term home grower and he immediately knew why and showed me that the new growth was from below the graft... that can was in the garbage can within the hour as all the growth was from the graft... maybe could have been saved by grafting sweet citrus variety..
Reply by Steve I Morse
on February 11, 2019 at 4:07 PM
See above
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