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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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Care for peonies after they bloom

Now that the peonies have finished blooming, what’s the best thing to do with them – leave them or cut them back? Ours often get an ugly coating of powdery mildew on the leaves in the summer. Is there a way to prevent this?

After they bloom, peonies spend the rest of the summer gathering strength to bloom next year before they die back to the roots in winter. A good first task for the gardener is to cut off the faded flowers. Garden expert P. Allen Smith suggests removing the seed pods and lightly fertilizing in late spring or early summer. But be sure to leave the foliage. After the blooms are gone, the rich green leaves of peony shrubs remain an attractive feature in the garden – except when it develops a case of powdery mildew. Continue reading

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Coffee grounds as mulch? Don’t do it!

I get coffee grounds from my local coffee shop. Can I use them directly on the soil as mulch (without mixing anything into it except to rake it into the soil)? The grounds are wet when I get them from the coffee shop. Should I let them dry out a little before putting it on the soil?

coffee groundsIn just about every listing of “ingredients” for a successful compost pile, you’ll find coffee grounds among the nitrogen-rich kitchen waste “green” ingredients that make up the mix. But it’s a mistake to use coffee grounds alone. They are very acidic, and over time will change the pH of the soil – the measure of its acidity or alkalinity – to the point that plants that prefer alkaline soil will suffer. Continue reading

Prune roses for better blooms

We have a rose bush that is out of control and really needs pruning. Can it be done now? Or is it better to wait until next spring?

Yellow rose

Rose experts say that roses can be pruned anytime they are actively growing. Start by trimming out the older wood first, along with any dead or dying canes. You may also want to remove canes in the center of the bush to provide better air flow, any canes that cross and rub each other, or any twiggy growth that might be tempting to spider mites.

The Nashville Rose Society provides general pruning guidelines: each pruning cut should be made about ¼-inch above an outward-facing bud eye (where the leaf is attached to the stem). Use sharp bypass pruning shears, which will make a clean cut without crushing the stem.

An added tip: remove the spent blooms of roses regularly to encourage the plant to bloom more.

Serious rose growers may do a more severe type of pruning in the fall to winterize bush roses. Nashville Rose Society also provides general guidelines for this process: Stop fertilizing roses early in August to allow the plant to slow down producing new growth, then in early October, stop cutting off the dead flowers. In late November or early December, cut the canes back to 2 to 3 feet and place a mound of mulch around the bush.

Next spring, once the weather begins to warm up, move the mulch away from the roses and prune to about 12 inches to get new growth.

In Saturday’s Tennessean

land trust signThe Ernest and Berdelle Campbell Land Trust Garden is a quarter-acre oasis in Nashville’s tightly-packed Germantown neighborhood. “This will always be green space,” Berdelle Campbell says. Read about the garden and Berdelle’s agreement with The Land Trust for Tennessee in Saturday’s Tennessean, and find more here about my visit with Berdelle, and more photos from the garden.

Free daylilies!

A Middle Tennessee reader emailed last week to say that she has a back yard full of daylilies that she can no longer take care of, and she is trying to find a home for them. “There is a huge assortment in lots of different colors and types, mostly full size but some miniatures,” she wrote. “My grandmother and mom collected them over the year and I don’t really know any of their names.”

If you are looking for daylilies, are willing to take a chance on sizes and colors, and can dig them up yourself, she is willing to donate. Interested? Email me at gloria@gloriaballard.com and I will put you in touch.

Fortunately, the best time to dig and divide daylilies is coming up. I wrote about how to do that task here.

Spider mites can ruin your roses

What could be stripping the leaves off the branches of my roses? I spray with a product that is supposed to protect roses from insects and diseases, but it hasn’t helped.

Knock Out roseKeep an eye on roses when it’s hot and dry. That’s when spider mites do their worst damage, say rosarians at the Nashville Rose Society, and they can turn a lovely rose bush into an ugly mess.

The tiny creatures get on the undersides of leaves and feed on the plant’s juices. The damaged leaves look speckled, turn yellow and fall off.

Spider mites are not insects; they are more closely related to spiders, so insecticides won’t have any effect. You can use a miticide, but it can be expensive. The best and cheapest way to control them is with a blast of water directed at the undersides of the leaves, rosarians say. If you do this every three days for a week or so, you break the mites’ gestation cycle.

Here’s a little more information about the tiny arachnids: Adult mites are less than 1/50 inch long. They use their mouthparts to pierce individual plant cells and remove the liquid. They produce webs that can coat the foliage with a fine silk that collects dust, making the leaves look dirty.

You can’t see them, but you can certainly see the damage. Heavily infested plants will be discolored, and if they are not controlled, the rose can be stunted, or even killed.

Prune azaleas soon after they bloom

Our azaleas are too large and need to be trimmed. When is the best time to prune them?

AzaleaIn general, azaleas rarely need pruning, but if you find you need to reduce the size of the shrubs, the best time to prune them is right after they finish blooming. The buds for this year’s azalea blooms began forming last summer, so if you prune now, before they bloom, it means you are cutting off many of the flowers before you have a chance to enjoy them.

Southern Living garden writer Steve Bender, who edited the new edition of the Southern Living Garden Book, suggests this method for pruning azaleas: determine where the height or width needs to be reduced. Then, using hand pruners (or loppers, if the branches are thick), reach in and cut back individual branches to different lengths to create a mounding shape. Do not, he admonishes, use hedge trimmers to shear azaleas. Besides looking boxy and unnatural, this results in flowers and foliage that grow only on the outer portions of the shrubs.

Two other notes from Steve’s advice, which you can read here:

-If you do the job at the proper time, you can cut evergreen azaleas back pretty hard – even back to bare wood — and they should survive and flourish.

-If yours are the ‘Encore’ type of azaleas, which bloom in spring and again in late summer or fall, prune right after the spring bloom.

Divide irises after they bloom

Our bearded irises are coming up and they’re pretty crowded this year, and need to be dug up and divided. If we divide them now, before they bloom, will we still have flowers this year?

Purple irisIf your iris bed is crowded but still producing blooms, it is best to wait until later to dig up the iris bed and divide the rhizomes. The experts at the American Iris Society and other sources say iris beds should be divided every three to five years, and suggest mid- to late-summer as the best time for this task.

When the time comes this summer, here is the method suggested by author Judy Lowe in Month-by-Month Gardening in Tennessee & Kentucky:

Cut the leaves in a fan shape about 6 inches tall, then lift the clump with a spading fork, wash off the dirt, and inspect the rhizome for soft spots, damage or disease.

Cut the rhizome into smaller pieces with a sharp knife, making sure each piece includes an eye or a bud. Cut away any older growth. Lowe notes that iris rhizomes are susceptible to fungal problems, and suggests dipping the rhizome briefly into a solution of one part liquid bleach to nine parts water.

Replant the sections: Dig a hole and make a mound of soil in the center, then place the rhizome on top so that its roots spread over the mound. Cover the roots, but maintain the rhizome at soil level or just below it. Bearded iris rhizomes that are planted too deep may rot, she says. Water the bed well.

Dividing in summer allows the rhizomes to become established before the end of the growing season, and more likely to bloom well next spring.

Color Garden book giveaway

Thanks to readers who left comments this week for a chance to win The Nonstop Color Garden by Nellie Neal. Constance is the winner of the random drawing.

Nellie, her book, and information from Doris Weakley of the Perennial Plant Society of Middle Tennessee were featured in a story in last Saturday’s Tennessean. You can read it here.

And watch for another book giveaway soon.

What’s blooming indoors? Meyer lemon

I have a Meyer lemon tree that I keep indoors. It’s often full of blooms and the flowers smell wonderful. I’m always looking for lemons to start growing, but the flowers dry up and fall off and I never get any fruit.

meyer lemon flower closeup 3As long as the tree is indoors where the air is still and there aren’t any insects flying around, your Meyer lemon will most likely continue to be a delightfully fragrant but non-fruit-bearing plant. What the flowers need to produce fruit is the process of pollination.

You’ve heard of the birds and the bees, right? Outdoors, flying insects (bees and other pollinators) go from flower to flower, dipping into the pollen on the stamens – the cluster of thin filaments — and spreading it to the stigma at the center of the flower.

Indoors, if you want fruit, you’ll have to take care of that little detail yourself. Lemon trees are self-pollinating, meaning that the flowers shed pollen directly onto the stigma, but they still may rely on wind or insects — or human intervention, if necessary — to shake things up.

Here’s how you can help: As the flowers open, use a cotton swab or a small artist’s paintbrush to collect pollen from the anthers (the tips of the stamens), then rub the stigma with the swab to transfer the pollen. It’s a slow process, but the tree should begin to produce lemons (which grow fairly slowly, by the way).

Meyer lemons growing indoors where winters are cold need a lot of sunlight, and they also benefit from time spent outside when the weather warms up. Place a lemon tree in a protected spot outdoors, moving it gradually into full sun, when nighttime temperatures stay above about 50 degrees. Outdoors, the bees will do the job of pollinating the flowers, of course.

In general, Meyer lemon trees thrive in good potting mix in a container that drains well. Make sure the soil doesn’t dry out completely, but don’t overwater it, either. Fertilize regularly with an organic fertilizer designed for citrus, following directions on the label. (I’ve used Espoma’s Organic Citrus-tone citrus and avocado food, with good results).