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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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Leafrollers make a meal of cannas

My cannas were growing well and I thought should be about to bloom when I noticed that the leaves hadn’t opened, and they looked like they’d been stitched together! When I unrolled the leaves, I found a little grub and some other black substance. What is that? What can I do about it?

Your cannas have become host to a fairly common creature throughout the southeast called a canna leafroller, and it can do quite a bit of ugly damage to this summer-flowering favorite.

The grub you see when you unroll the leaves is the larval stage of a little brown moth. The adult moth lays her eggs on the surface of the leaves; when the eggs hatch, they begin to feed on the leaves, and as they grow, fasten the unrolled leaves together with tidy silk stitches.

There are actually two leaf-rolling species that infest cannas; the one you describe is the lesser canna leafroller, most easily distinguished by the mass of dark caterpillar droppings (called frass) inside the rolled leaf. The larger canna leafroller keeps its feeding den clean.

The best way to control canna leafroller is to watch for the evidence of the moth and her eggs (tiny, and a whitish-yellow color), and the neat silky stitches on the leaves before they begin to unfurl. If you unroll a leaf and find a grub inside, flick it out where a bird can enjoy it.

In late winter, cut the dead stalks of canna plants to the ground and dispose of it, which reduces the early, over-wintered population of leaf rollers. Watch for re-infestation as the cannas grow. If you feel you must spray something, horticulturists suggest products that contain Bt – Bacillus thuringiensis – as they are less toxic to beneficial organisms.

The University of Florida extension has a good description of the pest, its life cycle, and management practices here.

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