How to Get Rid of Crepe Myrtle Shoots: Root-Cutting Method That Stops Regrowth

How to get rid of crepe myrtle shoots and reclaim your yard from an unruly jungle—try the root-cutting method. ✂️ I’ve battled these stubborn volunteers for years, and the root-cutting method finally gave me control—no more endless regrowth. The secret lies in cutting deep enough to starve the roots while protecting your lawn and other plants.

This method works best in late winter or early spring, when the plant’s energy is dormant. You’ll need a sharp shovel, gloves, and a clear day for visibility.

The key is cutting 6-8 inches below the soil surface to sever the root system completely—any shallower, and you’ll just encourage more shoots.

What you’ll end up with is a clean yard free of crepe myrtle volunteers, and the best part? No chemical residue or harm to surrounding plants. The roots eventually weaken and die without new shoots to replace them, giving you long-term relief.

For large infestations, repeat the process in sections over a few weeks. Avoid tilling, as it can spread root fragments. If you’re dealing with an established tree, focus on the shoots first before tackling the main trunk later.

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Step-by-Step instructions for eliminating crepe myrtle shoots

Here’s the foolproof method I’ve used to permanently stop crepe myrtle regrowth—no more stubborn sprouts popping up everywhere.

Crepe myrtle shoots grow from deep, sprawling roots, so you need to target the entire root zone. Walk around the area where shoots appear and mark a 2-foot radius around the base of the main tree or where the worst clusters grow. Use a garden hose or spray paint to outline the zone—this helps you visualize where to dig.

Dig a 4-inch-deep trench around the perimeter of your marked area. This exposes the lateral roots that send up new shoots. If you see thick, woody roots, those are the main culprits. I like to use a flat shovel here—it slices cleanly without chopping roots into tiny pieces that can regrow.

Once the trench is dug, use a pruning saw or sharp spade to sever the roots at 6-8 inches below the soil surface. You’re aiming to cut through the thickest roots while leaving smaller ones intact—they’ll decompose over time. I find that vertical cuts work best; horizontal cuts can leave root fragments that sprout anew.

Don’t rush this step. If you miss a root, new shoots will pop up. After cutting, pull up any remaining root pieces you can reach by hand. If the soil is dry, water it lightly to make the roots easier to remove. The goal is to eliminate as much of the root system as possible in one go.

Fill the trench with undiluted white vinegar or a glyphosate-based herbicide (follow label instructions). Vinegar works well for small areas—it kills roots on contact—but glyphosate penetrates deeper and is better for large infestations. I prefer glyphosate for stubborn crepe myrtle because it ensures the roots don’t just slow down.

Water the entire marked area thoroughly after applying the treatment. This helps the solution seep into the soil and reach any remaining roots. Avoid watering for 24-48 hours afterward to let the herbicide work its magic. You’ll know it’s effective when new shoots stop appearing within 2-4 weeks.

Check the area every 2 weeks for new shoots. If any appear, dig them out immediately—don’t let them grow. Over time, the treated roots will decompose, and the soil will become inhospitable to crepe myrtle regrowth. For the first 3-6 months, stay vigilant, as dormant roots can sometimes sprout.

If you still see shoots after 6 months, repeat the root-cutting process in the same area. Sometimes, you’ll need 2-3 treatments to fully eradicate the root system. Once the area is clear, you can replant with grass, mulch, or other ground covers to keep crepe myrtle from taking over again.

To keep crepe myrtle from spreading, install a deep root barrier (like a 2-foot-tall plastic or metal edging) around the perimeter of your treated area. Bury it 6-8 inches into the ground to block any remaining roots from spreading outward. This is especially useful if you have crepe myrtle trees nearby.

Mulch the area heavily with 3-4 inches of wood chips or gravel to smother any remaining roots and prevent sunlight from reaching the soil. Over time, the mulch will break down and suppress weeds while keeping the area crepe myrtle-free. With this method, you’ll never have to deal with those pesky shoots again!

Tips & tricks for eliminating crepe myrtle shoots

Real talk: I've spent years battling crepe myrtle regrowth, and these tricks saved me from pulling out my hair. The key is precision—miss a root, and you're back to square one.

Precision Over Speed: In Step 1, when marking your 2-foot radius, I can't stress enough how important it is to be thorough. I've seen people miss just a few inches, and those small patches of roots will send up new shoots like clockwork. Use a measuring tape to verify your 2-foot radius—don't eyeball it. Also, for Step 2's 6-8 inch depth, I recommend marking your shovel blade with tape at the 6-inch point to ensure consistent depth every time you cut.

Tool Selection Matters: The instructions mention a pruning saw or sharp spade, but I've found that a handsaw with a fine-tooth blade works best for the vertical cuts in Step 2. It gives you more control and cleaner cuts than a spade. For the 4-inch trench in Step 1, a flat shovel is ideal, but if you're dealing with rocky soil, consider a mattress shovel

Treatment Timing is Critical: When applying your root-killing treatment in Step 3, I've learned that timing matters more than you'd think. If you water immediately after applying glyphosate, you dilute its effectiveness. The 24-48 hour no-water rule isn't just a suggestion—it's when the herbicide penetrates deepest. For vinegar treatments, I recommend applying on a sunny day when temperatures are above 70°F for maximum effectiveness.