Answer: Immature maples sometimes develop odd branch patterns. I'd prune it to make it look more symmetrical. First, start by removing the low hanging branches, then prune to even things up so it is no longer lopsided. If you need to remove an entire limb, cut it cleanly back to the trunk of the tree. Otherwise, remove small side branches by cutting them close to a main branch. I typicially prune my Japanese maples in the early spring (never removing more than one-third of the live material), then I selectively prune out misplaced branches as the summer progresses. Although its 15 years old, I've managed to keep my Japanese maple short (about 5') with a roundish canopy. You can do the same. Best wishes with your maple!
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