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  • Upcoming Garden Events

    Sept. 30: The Nashville Herb Society presents Through the Garden Gate: A Glimpse of Edwardian England, 8 a.m. – 3 p.m. at Cheekwood Botanic Hall. Celebrate the gardens, foods and flowers that delighted Downton Abby family and friends at the turn of the 20th century. The event begins with a hearty Edwardian breakfast, followed by three speakers: Marta McDowell on Beatrix Potter’s Gardening Life; Geraldine A. Laufer on Tussie Mussie – Victorian art of expressing yourself in the language of flowers; and Terry White, The English Garden event florist . Registration includes breakfast, box lunch in the garden with music, English tea and cookies. To learn more or to register, visit www.herbsocietynashvlle.org.

    Tips & tasks – September

    Cut the dead tops of coneflowers, but leave enough for goldfinches to enjoy the seeds.

    Plant cool-weather vegetables for a fall crop: spinach, mustard and turnip greens, radishes, leaf lettuce.

    Start a new lawn of cool-season grass, such as fescue, or refurbish or repair establish lawns.

    Don’t let the soil of newly planted grass dry out. New grass needs about an inch of water per week.

    It’s still warm, so continue to water and weed garden beds as needed.

    Remove dead foliage, spent flowers and other garden debris; replenish mulch as needed.

    Continue to harvest produce, which may be getting a boost now from slightly cooler weather. Keep watering sage, rosemary and other perennial herbs so they’ll be in good shape to get through winter.

    Prepare to bring houseplants back indoors: remove dead leaves, scrub soil from the sides of the pots, treat for insects. Bring tropical plants in before nighttime temperatures dip to 55 degrees.

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Blight sours sweet woodruff

QUESTION: I had a big, fragrant patch of sweet woodruff in a shady raised bed that suddenly began turning gray and dying off in the center. Within a few days almost all of it had turned gray or black, and now there are just a few sprigs left around the edges. What happened?

Sweet woodruffRapid die-off is often an indication of some kind of blight, and a little research into this symptom in sweet woodruff (Galium odoratum) turned up the disease called Rhizoctonia web blight. It’s caused by the fungus Rhizoctonia solani, which is the source of an array of cankers, rots and diseases. Web blight develops in hot, humid weather.

Look closely at the dead and dying plants, and you may be able to see fine webbing that sticks to the leaves and stems and across the surface of the soil. It’s common on sweet woodruff, and also attacks Dianthus, Coreopsis, ferns, hibiscus, goldenrod and yarrow.

I found this information at the web site of the University of Maryland  Extension, where they explain that the blight usually doesn’t kill the roots of the plants, but it’s best to remove dead plants and debris right away.

To reduce the chance of development of the disease, thin the plants out a bit to improve air circulation. Remove mulches and other debris from the area. Cut plant debris at ground level and remove it in the fall.

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