The root stock they were grafted onto are taking over the plant. Remove any suckers at the base of the plant. I had the same thing happen to a lime tree that I neglected.
No, not in the case of my lemon. It already WAS the rootstock of the original citrus tree. The fruit was completely a lemon in every other way and never did the orange transformation again.
Name: Daisy I Reno, Nv (Zone 6b) Not all who wander are lost
If your tree is the rootstock of the original, it is a sour orange. Apparently, weather conditions were right for it to color up.
Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and proclaiming...."WOW What a Ride!!" -Mark Frost
President: Orchid Society of Northern Nevada
Webmaster: osnnv.org
My lemon tree is a rootstock but it is not sour orange or trifoliate orange, it is a true lemon of some sort and produces superior fruit - just one year they turned orange...
Name: Daisy I Reno, Nv (Zone 6b) Not all who wander are lost
Your tree must be special. I don't know of any lemons that have ever been used as rootstock. You may have a rootstock similar to a lemon.
Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and proclaiming...."WOW What a Ride!!" -Mark Frost
President: Orchid Society of Northern Nevada
Webmaster: osnnv.org
