Protection from BTM

Boxwoods are one of the most loved shrubs in Cincinnati landscapes, known for their lush greenery and year-round beauty. But a serious threat has made its way into our region: the Box Tree Moth (BTM).

This invasive pest is especially concerning for Cincinnati gardeners and homeowners, as it feeds exclusively on boxwoods. Left untreated, it can strip a boxwood bare in just days.

At Natorp’s Nursery Outlet—Cincinnati’s trusted plant experts—we’re here to help you protect your landscape investment.

What Cincinnati Gardeners Need to Know About Box Tree Moth

• Active Season: April through October

• Generations: Multiple cycles per year, meaning continuous risk

• Damage: Caterpillars chew leaves, create webbing, and can destroy boxwoods quickly

The key to protecting your plants is regular inspections and prompt treatment.

How to Protect Your Boxwoods

1. Inspect Weekly

Check your boxwoods once a week for:

• Chewed or skeletonized leaves

• Webbing and green caterpillars

• Tiny droppings (frass)

• Browning leaves

In humid summers, BTM caterpillars thrive—so careful inspections are essential.

2. Treat Immediately If Caterpillars Are Found

If you spot caterpillars:

• Spray with Bt(k) or Eight insecticide (available at Natorp’s).

• Apply using a hose-end sprayer, tank sprayer, or hose-end bottle.

• Soak every leaf and stem—coverage matters.

• Always follow label directions.

3. Monitor Daily After Spraying

Sprays may take a couple of days to work. Keep an eye on your plants to ensure the caterpillars are under control.

4. Reapply in 7 Days

A second thorough spray one week later will help eliminate any remaining caterpillars.

5. Stay Consistent Through the Cincinnati Growing Season

• Inspect weekly through October.

• Restart monitoring in April to get ahead of next season.

Can Damaged Boxwoods Recover?

Yes! Take these steps:

• Rejuvenation pruning encourages fresh growth
• Cut stems back 6–24 inches in late fall, winter, or early spring
• Many boxwoods bounce back beautifully

If removal is necessary, bag the damaged plants securely to prevent the spread of caterpillars.

The Bottom Line

Boxwoods are a Cincinnati classic—and worth protecting. With consistent care and quick treatment, you can keep them lush, green, and thriving.

Visit Natorp’s Nursery Outlet in Cincinnati (Fall 2025 Opening August 28) for expert advice and the right products to safeguard your landscape this season.

Why Cincinnati Gardeners Trust Natorp’s

For over 100 years, Natorp’s has been Cincinnati’s trusted plant expert. As the region’s largest locally owned nursery, we’ve helped generations of gardeners create and protect thriving landscapes. Our team understands the unique challenges of gardening in Southwest Ohio’s climate—and we’re here with the expertise, products, and guidance you need to keep your boxwoods healthy and beautiful.