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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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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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