A crape myrtle stump is really a clump of several trunks joined at one crown, and that crown sprouts readily, so cutting the tree to the ground almost never kills it. Grinding the whole crown below grade, or treating every fresh cut with a labeled herbicide, is what stops it.
A clump, not a trunk
NC State Extension describes common crape myrtle as an erect, multi-trunked tree or shrub, and Clemson's pruning advice is to keep three to five of the strongest trunks at ground level. Those trunks all rise from one shared crown. Cut them off and you are left with a knot of wood a good deal wider than any single trunk. That knot is the stump. Treat it as one piece when you measure it, kill it or grind it, because a section of crown left alive at one side can be enough to put up a new clump.
Why cutting to the ground does not kill it
Crape myrtles sprout from the base even when healthy. Clemson Extension notes that basal sprouting may happen whether the tree has been pruned or not, and advises pulling those sprouts while they are still soft and removing any future growth from the ground. Take the whole top off and the roots, still full of stored food, have only the crown left to push through. A ring of new shoots is the usual result, and that is the moment most people start searching for how to kill a crepe myrtle stump.
How to kill a crepe myrtle stump with herbicide
If you go the chemical route, timing decides it. Cut every trunk low and flat. Treat each fresh cut straight away with a product labeled for cut-stump use. Penn State Extension's cut-stump advice for invasive Callery pear shows the general rule: water-based mixes go only on the freshly cut surface immediately after cutting, while oil-based ester mixes can be put on the top and down the bark of the stump. Treat every trunk in the clump, not just the big ones. Follow the label for rate, protective gear and limits near other plants, and pull any green sprouts later while they are soft. The stump-killing guide covers the products.
Grinding the whole crown
Grinding removes the crown itself, which is where the sprouts come from. Crape myrtles usually stand close to something: a corner of the house, a driveway apron, a mailbox, a bed edge. The machine is tracked and narrow enough for a standard yard gate, and it comes at the stump from the lawn. The wheel works the crown down until it sits four to eight inches beneath the bed, and outward until no knuckle of old trunk is left at one side to sprout. In a bed, ask for the grindings to be hauled or kept apart from your mulch; stump grinding in a flower bed explains why.
Topping, bark scale and other reasons they come out
Plenty of crape myrtles come out healthy, because a variety that wants to reach thirty feet was planted where ten would fit. NC State Extension says severe pruning or topping should not be needed to control size, which is a polite way of saying the wrong variety went in. Clemson calls the topped look Crape Murder. Others come out because of pests. NC State lists aphids, scales and flea beetles as problems, and says crape myrtle bark scale is usually managed with pesticides, and that scrub brushes can remove the scale itself. Once the trunks are off, the stump is the same job whatever the reason.
Planting after a crape myrtle
NC State lists crape myrtles from miniatures of two to three feet up to upright forms of twenty feet, so the replacement can be sized to the spot. Plant it to one side of the ground-out area, in undisturbed soil, rather than in the loose fill of the old hole. Watch the first season for shoots from leftover roots and pull them while soft. If the replacement is another crape myrtle, NC State's advice applies to it too: thin it in late winter or spring before new growth starts, rather than topping it to keep it small.
Common Questions
Will a crape myrtle grow back if it is cut to the ground?
Usually, yes. Crape myrtles sprout from the base even when healthy, as Clemson Extension notes, and a cut-down one has nothing left but that base and a full set of roots. Without grinding out the crown or treating every fresh cut with a labeled herbicide, expect a ring of new shoots.
Is it better to dig out a crape myrtle or grind the stump?
For most yards, grind it. The crown is where the sprouts start, and grinding takes it out below grade without tearing up the bed or lawn around it. Dig it out only if something needs the ground itself, such as a footing, a walk or a new tree in that exact spot. That is a removal job with a hole to backfill.
How do I stop crepe myrtle suckers after the tree is removed?
Pull or clip them at the soil line as soon as they show, while they are still green and soft, and keep doing it. Each leafy shoot left to grow sends energy back to the old roots. If a patch keeps coming, your county Extension office can advise on a labeled product and the right timing.
What to Do Next
Tell us how many trunks the clump had and how wide the crown is at the ground, and send a photo of the way in. Jordan will come back with a real number. Call (828) 574-4474.