Prune a crepe myrtle lightly in late winter or early spring if it needs tidying, and leave its natural shape intact. Because it flowers on new growth, this is a reasonable time to remove dead or awkward branches. It is not a reason to cut every stem back to a stub each year.
Start with branches that need to go
Look over the tree before you cut. Remove dead growth, then check whether crowded branches are blocking air from moving through the interior. You may also want to show off the trunks: the bark on many crepe myrtles has color and peeling texture worth seeing. How many lower limbs to remove depends on whether you have a tree-form plant or a smaller, shrub-like variety. A fixed height for clearing the trunk will not suit every plant.
Heavy topping spoils the outline that makes an established crepe myrtle attractive. It can also produce long, thin shoots that struggle to hold the flowers. If you have a specific size problem, decide which branches actually create it before cutting. For a comparison with another flowering plant whose pruning timing deserves care, read about pruning hydrangeas.
Work with the tree’s mature size
Taking a set amount off every top branch each winter may make the tree shorter for the moment, but it does not solve a poor fit for the space. A crepe myrtle placed where it can reach its mature size usually needs less corrective pruning. That is worth considering before you plant another one, especially near a walkway or another planting you do not want crowded.
These trees earn their place through summer flowers, fall color, and trunks that remain interesting after the leaves fall. You can sometimes give a plant a light trim after the first flush of flowers if you want to encourage another, smaller display. Watch the shape of the whole tree while you do it; flowering is only one part of what you see through the year.
Give new plantings a place to grow
When shopping for a crepe myrtle, ask about the mature size of the particular variety rather than treating every one as the same tree. A smaller selection may be a better answer than annual hard pruning. Our article on flowering trees offers more ways to think about seasonal interest, and making a good tree choice starts with the space the tree will occupy.
