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  • Upcoming Garden Events in Middle Tennessee

    March 1 – 4: Nashville Lawn & Garden Show, Fairgrounds Nashville: The annual all-indoors garden event that features live garden displays, lectures, vendors, floral designs and special programming Wine Festival featuring Tennessee wines is Saturday (March 3), noon – 5 p.m. For more information on the events and the complete lecture schedule, visit www.nashvillelawnandgardenshow.com.

    April 7: Perennial Plant Sale hosted by the Perennial Plant Society of Middle Tennessee annual Perennial Plant Sale at The Fairgrounds Nashville. Find newly released and hard-to-find perennials along with a wide range of tried and tested varieties, all from top local nurseries. The sale opens at 9 a.m. and usually sells out by early afternoon. For more information, visit www.ppsmtn.org.

    April 14: Herb & Plant Sale hosted by The Herb Society of 9 a.m. – 2 p.m., at The Fairgrounds Nashville Sports Arena building. The sale offers common and rare varieties of herbs and heirloom vegetables and handmade pottery and herb markers by artist Roy Overcast for sale. For more information and a list of available plants, visit www.herbsocietynashville.org.

    April 21: Herb & Craft Fair hosted by First Unitarian Universalist Church of Nashville, 1808 Woodmont Blvd., 9 a.m. – 3 p.m. Top quality perennial and annual herbs, heirloom tomato plants, native and companion plants, along with food and craft items reflecting an interest in the homemade and homegrown: fresh homemade sweet and yeast breads, spice mixes, barbecue sauces, jams and jellies; knitted and sewn items, homes for birds and bees, and art, jewelry and more made from pressed flowers. Visit www.thefuun.org.

    May 12: Hosta sale hosted by the Middle Tennessee Hosta. Proceeds from the sale support the club’s activities. More information about the MTHS is at www.mths-hosta.com.

    May 19: Urban Gardening Festival, hosted by Master Gardeners of Davidson County, 9 a.m. – 4 p.m. (rain or shine) at the Master Gardeners’ Demonstration Garden at Ellington Agricultural Center (5201 Marchant Drive in Nashville). The free event includes information about a variety of gardening methods and techniques, local artisans, exhibiters, growers and more. For information, visit www.mgofdc.org/ugf.

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Good bugs vs. Bad bugs

Question: I have found several big green caterpillars covered with something that looks like white eggs on two of my tomato plants. What are they? How can I get rid of them?

A tobacco hornworm covered with wasp cocoons, and one without.

A tobacco hornworm covered with wasp cocoons, and one without.

What you are seeing is a good example of Nature helping you to control some of the pests in your garden. The green caterpillars are tobacco hornworms, which can chew up big portions of a healthy tomato plant before you even know they’re there. The white things are the cocoons of braconid wasps, parasitic wasps whose larvae feed on the hornworm, ultimately killing the caterpillar. The wasps, which are very small and not a stinging type, are considered beneficial insects in large-scale agricultural production and in home gardens.

Here’s how it works: A female braconid wasp lays eggs under the skin of a hornworm. The eggs hatch, and the larva begin eating the caterpillar’s insides and chew their way out through the host’s skin when they mature. On the outside, they spin the little oval cocoons along the caterpillar’s back and sides. By the time the adult wasps emerge, the hornworm is weakened and will soon die.

If you see a green hornworm on tomato plants – and they’re hard to spot, being exactly the color of tomato leaves! – pluck it off and dispose of it. But if you find one with white cocoons all over its back, leave it in place. It’s hosting another generation of parasitic wasps that will seek out and destroy hornworms on your tomatoes.


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