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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  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 Nashville, 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 herbsocietynashville.org.

    May 12: Hosta sale hosted by the Middle Tennessee Hosta Society. 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. 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, exhibits, growers and more. For information, visit www.mgofdc.org/ugf.

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Dayflower gives gardens the blues

QUESTION: There’s a weed spreading through my perennial bed, under the trees and even growing out of a pile of stepping stones in my yard. It has small, two-petal blue flowers and long, pointed leaves. What is it? And more importantly, how can I get rid of it?

DayflowerIt sound like you are describing Asiatic dayflower, a weedy annual that grows and spreads quickly and will consume anything in its path if you allow it to proceed. It blooms summer into fall, opening its flowers in the morning (it actually has three petals; two blue and one smaller petal that’s smaller and more pale) and closing up tight by late afternoon. It reproduces from seeds dropped each year, but it also spreads vegetatively, rooting at the leaf nodes on moist soil. Common Asiatic dayflower is in the same family as spiderwort.

Dayflower grows in a variety of conditions, but really spreads aggressively in moist, shady spots. As explained in the Illinois Wildflowers database site, “At favorable sites, the Asiatic Dayflower forms colonies that can exclude other species of plants.”

Dayflower patchSo yes, you may want to try to eliminate dayflower from your garden. It won’t be easy. Glyphosates (Roundup and other non-selective herbicides) don’t faze it, apparently. Gardeners who have struggled with it say that it’s easy to pull out of the ground, but even if you think you’ve gotten every single leaf, stem and root, it likely will come back. It’s easiest to pull up when it’s young and small. Diligence is advised.

Here are some comments I read in a forum at Dave’s Garden as I researched Commelina communis:

“It seems to grow several inches over night and can overwhelm an area in little time.”
“Invasive as they get — one of my biggest pests!”

“This plant is a superweed!”

But let’s end with a couple of good things to know about Asiatic dayflower and its blue blooms: Usually, flowers we call “blue” are closer to violet or purple. The flowers of Asiatic dayflower are truly blue, a color that is found in few other plants. And a commenter at the Dave’s Garden forum says this: “It is extremely invasive; but at least it is edible. The young leaves and stems can be added to salads or boiled for 10 minutes and served with butter.”

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