Why do my Mandarin trees get suckers on them?

Penne Johnson
by Penne Johnson

Can someone tell me why these trees get suckers on them? I had to cut 2 off today and they grow much fasterthan the tree LOL. My little dwarf has loads of oranges starting to get bigger, and because I have so many people saidI might have to take some off I'm sure there is a site to look it up but wonder if anyone else has the same. Thanks

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