I have two fruit trees about 3-4 years old. The apricot (Blenheim) is doing fine, but the plum (Santa Rosa) keeps making suckers from the base. I removed these and it looked like the tree was leafing out the same as the apricot, but now more suckers from the base.

Is there a reason that only one of these keeps making suckers? Inquiring minds...

TIA

HB