I have a tree like that in my front yard. What I had to do was pull the mulch out & build a raised bed around it.Mine's almost 2 ft tall. For the past 3 years, I've filled it with begonias, then mulched the begonias. There's still a few seedlings that come up, but not as many as before & the begonias bloom just about until the first frost. I'm in northern Mississippi.So, in the summers, I do alot of watering,so I try & catch the small seedlings when I water. Good Luck!!!!
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