Vegetables and fruits
Annabelle and White Dome hydrangeas, blue larkspur and the painted seed heads of allium form a July Fourth bouquet of flowers cut fresh from the garden. © Jo Ellen Meyers Sharp
Even though the season of summer just arrived last weekend, the growing season has been upon us for three months.
And with all of the rain the last several days, plants have been on steroids, seeming to be ahead of their usual performance.
Weeds, in particular, seem to be thriving in my yard, and with the heat and humidity, the task of getting them under control is not pleasant. Hostas, too, seem to have emerged bigger and more lush this year. Some of us think this may have more to do with the past winter rather than the current season.
Some plants, especially those in pots, have just rotted off because of the humidity and rain. My sweet alyssum has all but disappeared because of the heat and rain.
What to do:
- Apply a water-soluble fertilizer to pots, window boxes and other containers. Fertilize vegetables, too. For this, I prefer a granular product. Read and follow the label directions.
- Give annuals a haircut, especially if they’ve grown leggy. Cut back to tidy up and shape the plant. With the dose of fertilizer, the annuals will snap back in no time.
- Deadhead perennials. Not only does this tidy up the plant, it encourages the development of more blooms from side shoots.
- Try to keep weeds under control. Weeds rob desirable plants of the nutrients they need to thrive. Fortunately, weeds are easier to pull after a rain.
- Monitor for fungus diseases on plants. Fungus causes mildew, fuzzy growth and spotted leaves, as well as root and stem rot. Once a fungus is on a plant, there’s not much to do. Most fungus is opportunistic, which means the right conditions have to be in place for it to occur. If you chose to use a fungicide, always read and follow the label directions. Fungicides, even organic ones, are deadly to bees.
- Be on the look out for aphids and other bugs. With all the rain, aphids may come calling for their favorite meal –bursts of tender plant growth. Also earwigs and millipedes seem to be abundant this year.
- If your pots can be viewed from all sides, rotate them periodically to ensure good light exposure for the plants.
Lastly, pick a bouquet of red, white and blue flowers for your Fourth of July celebration and enjoy the holiday.
Downy mildew has taken a toll on basil the last few years. One symptom: fuzzy spores on the undersides of leaves. Photo courtesy Purdue Plant and Pest Diagnostic Lab
Basil has taken a huge hit over the last few years from a downy mildew, which can quickly decimate a crop in the farmers’ fields, growers’ greenhouses and our gardens.
Downy mildew is the common name for this disease, even though the fungus that causes it may be different, depending on the plant. It gets the name from the symptoms, downy-like fuzz on the leaves.
On basil, the culprit is Peronospora balbahrii. Initially, the leaves turn yellow, and then black spots appear. That’s followed by fuzzy spores on the undersides of leaves. The problem starts at the base of the plant and moves up. The fungus is air borne or can be splashed on plants from infested soil. Plants and seeds can be infected, according to the University of Minnesota Extension, which got its first reports of the disease in 2012.
Here in Indiana, Purdue University has seen only a handful of samples since 2009. “A couple each year,” said Tom Creswell, director of Purdue’s Plant and Pest Diagnostic Lab.
“Most of our reports from the home garden have been from the home garden of Tom Creswell,” he joked. “It seems that if this is showing up extensively in the home garden, then either no one is paying attention or it comes on so late in the season that they’ve already made pesto, or they don’t know they can send samples to the lab for help.”
What can we do?
- Remove any infested leaves. It’s all right to eat healthy leaves from infested plants.
- Plant resistant varieties. Sweet basil (Ocimum basilicum) is the most susceptible, which includes Genovese, Nufar, Italian Large Leaf, Queenette, Superbo, Poppy Joe’s and others, according to Minnesota extension. Red Rubin and Red Leaf (O. basilicum purpurescens) and lemon basils (O. citriodorum) are considered moderately susceptible. Blue Spice, Spice, and Blue Spice F1 (O. americanum) are less susceptible.
- Don’t plant basil in the same spot year after year. If you grow basil in a pot, dump the soil each year and scrub the pot with a solution of one part bleach and nine parts water. Use fresh potting mix each year.
- Give plants plenty of air circulation.
- Closely examine basil plants at garden centers to make sure they are symptom free.
- Consider growing basil from seed. It’s easy and plants comes up quickly.
Lilac tree flowers are as fragrant as their shrub cousins. (C) Jo Ellen Meyers Sharp
At garden centers, on garden tours, over dinner and in emails, people are asking about a tree with fragrant white flowers.
It’s a Japanese lilac tree (Syringa reticulata), a gorgeous beauty that blooms later than lilac shrubs. The ornamental tree has a rounded to pyramid form and reaches 30 feet or more tall and 20 feet wide. It is considered one of the easiest lilacs to grow.
The 12-inch long, creamy white flowers bloom in June, attracting butterflies, hummingbirds, pollinating insects and human attention. Cardinals, chickadees and finches like the seeds. The tree tolerates clay soil, deer browsing and salt spray.
Japanese lilac tree does best in full sun but tolerates light shade, which may reduce blooms. It needs decent drainage and is considered a good urban tree. You’ll see it planted as a street tree in several Indianapolis neighborhoods, along the Indiana Central Canal, the city of Carmel and other communities. It also makes a lovely hedge, windbreak or seasonal screen.
Good air circulation is recommended, even though the tree is considered resistant to powdery mildew, the plague of many shrub lilacs. It also is resistant to scale and borers, other pests of lilacs. If the lilac tree needs to be pruned, do so within a month after it is done blooming.
There are a couple of cultivars, but ‘Ivory Silk’ is the most widely available. More compact, ‘Ivory Snow’ gets up to 25 feet tall and is a profuse bloomer, usually a little earlier than the straight species of Syringa reticulata.
The seed capsules dry and are abundant enough to provide a bit of fall interest. The smooth, attractive, reddish-brown bark resembles a cherry tree.
For more information about the lilac trees and shrubs, download Lilacs for Cold Climates, a very helpful, free publication by Laura Jull, a horticulture professor at the University of Wisconsin.
Native Virginia bluebell form a carpet of blue beneath the yellow Japanese Kerria. (C) Jo Ellen Meyers Sharp
If I could only have one perennial for certain situations, such as shade or sun…that’s what we talked about in last week’s column. This week, we’ll look at a few shrubs and trees.
First up is viburnum, a species that has a shrub for about any location. There are several native viburnums that are garden worthy, including arrowwood (V. dentatum) and the American cranberry bush (V. opulus var. americana), sometimes listed as V. trilobum).
But my favorite is burkwood viburnum (V. x burkwoodii), a large, semi-evergreen shrub with fragrant, pinkish-white, waxy flowers in April and respectable leaf color in fall. Although burkwood does best in full sun, mine has been in part sun for years and does just fine. It gets about 8 feet tall and 6 feet wide. The size and the fact that it holds onto its leaves well into winter, make it a good choice for a three-season screen. It is drought tolerant and attracts butterflies and birds. The latter likes the showy fruit, which is not messy.
For deep shade, consider a kerria, sometimes called Japanese yellow rose (K. japonica). My preference is the single flowering kerria, called ‘Simplex’, but there’s a double flowering yellow (‘Pleniflora’) and single white one, too (‘Alba’). In my yard, the kerria gets early morning sun and blooms the same time as my Virginia bluebells (Mertensia virginica) to make a beautiful spring scene.
Kerria does not do well in full sun, which bleaches out the flowers. Arched chartreuse branches brighten the winter landscape. At maturity, it will get 3-6 feet tall and wide, suckering a bit to develop a colony. The suckers can be removed to keep kerria the right size for your space. It tolerates clay soil, dry and wet sites and deer. The flowers are about the size of a quarter and it’s not uncommon for kerria to rebloom in late summer. ‘Golden Guinea’ is slightly smaller than the species.
For a shade tree, I select a thornless honey locust (Gleditsia triacanthos var. inermis) for lots of reasons. The native tree provides dappled shade, which allows grass to grow underneath. The small ferny leaves also blow away in fall, reducing raking duties. This tree can become a problem if the roots are cut or removed, which can promote the growth of sprouts. There are several honeylocust cultivars available. At maturity, the tree will be 30 to 70 feet tall and wide.
Plants growing in containers, such as these at Sullivan Hardware & Garden near 71st and Keystone in Indianapolis, can be transplanted any time you can work the soil. (C) Jo Ellen Meyers Sharp
- Houseplants will need more water and fertilizer during summer growing period.
- Prune spring-flowering shrubs within a month after blooms fade.
- Supplement water as needed. Most newly planted stock needs an inch of water every week or 10 days. Established trees, shrubs and perennials can go several weeks without supplemental watering.
- Remove faded blooms from peony, iris, delphiniums and other spring perennials.
- Container-grown stock, including shrubs, trees, perennials and annuals, can be planted any time.
- Continue planting gladiolus for successive blooms.
Vegetables and fruits
- Discontinue harvest of asparagus and rhubarb in mid-June to allow foliage to develop and store food reserves for next year. Fertilize. Water when dry.
- Blanch (exclude from light) cauliflower when heads are 2-inches in diameter. Tie leaves up over the developing heads.
Broccoli head ready for harvest. Photo courtesy Purdue University
- Harvest spring plantings of broccoli, cabbage and peas.
- Plan your Halloween pumpkin. Determine the days to harvest for particular cultivar and count backward to find the proper planting date.
- Remove cold-season plants, such as radish, spinach and lettuce, as they bolt or form seed stalks.
- Every week or 10 days, continue planting carrots, beans and sweet corn for successive harvests.
- Do not be alarmed by June drop of tree fruit. It is a natural thinning process. If needed, help nature by thinning fruit to 6- to 8-inches apart and propping heavy branches.
Epimedium. (C) Jo Ellen Meyers Sharp
I get asked a lot of the time what my favorite flower is and my response is “whatever is blooming.”
But what if you could only have one of something, what would your choices be? Here are some of my picks:
Hydrangea – the oakleaf (H. quercifolia) would be my choice, but most are very large shrubs, usually in the 6-8 foot tall and wide range. That size is fine for larger properties. Because I have a small yard, I prefer Sike’s Dwarf, Pee Wee or Ruby Slippers, which are closer to 3-5 feet tall and wide.
Native in the southeast United States, oakleaf does best in part shade or dapple shade, but tolerates full sun if given adequate water. It begins blooming in June with white cone-shaped flowers that turn red as they age through the season. The leaves turn a deep, wine red in fall and persist through winter.
Sike’s Dwarf oakleaf hydrangea. (C) Jo Ellen Meyers Sharp
Bishop’s cap (Epimedium), commonly called barrenwort or bishop’s cap, is my choice for a shade-loving perennial. This is nearly a four-season plant, beginning with delicate, wiry flowers in early spring, followed by reddish-tinged, leaves. The leaves are dark green in summer, and in fall, become leathery, deep maroon. I cut this plant back to the ground in February. Epimedium thrives when given adequate moisture, but is tolerant of dryer sites. Start with two vigorous (but not invasive) cultivars: the yellow-blooming (E. x versicolor ‘Sulphureum’) and red (E. x rubrum).
‘Magnus’ purple coneflower (Echinacea purpurea). Photo courtesy perennialresource.com
Purple coneflower (Echinacea purpurea) would earn space in a sunny spot. Another eastern United States native species, this long-blooming perennial is favored by bees, butterflies and hummingbirds in summer and in winter, the finches devour the seed heads. There are a lot of garden-worthy cultivars available, but to me, the best performers are the straight species or ‘Magnus’. Somewhat drought tolerant, purple coneflower appreciates a good soaking of water during dry periods. Coneflowers are usually 24-30 inches tall and form a clump about 12-inches wide. They can self-sow a bit, but are not invasive.
Twin Oaks’ garden has been lovingly restored and rebuilt by John Herbst, president of the Indiana Historical Society, who resides in the home.
Photo courtesy Indiana Historical Society
Put on your walking shoes, slather on some sunscreen, grab an umbrella and a hat and head outdoors, for this is the season of garden tours. Most of the tours benefit the neighborhoods, garden clubs, education programs and other projects by the sponsoring groups.
Garden tours are rich with ideas for crafting your own landscape, examples of knockout plant combinations and exposure to plants you never heard of. Here’s a round up.
Historic Meridian Park, noon to 6 p.m., May 30 and 31. Start at Trinity Episcopal Church, 3243 N. Meridian St.
The 20th annual Indianapolis Garden Club Garden Walk, 9 a.m. to 3 p.m., June 3, five gardens.
Twin Oaks Home and Garden Tour, June 5 through 7. Built by L.S. Ayres, this was the late Ruth Lilly’s residence and garden, which is now leased to the Indiana Historical Society.
Meridian Kessler Home-Garden Tour, June 6 and 7. Seven homes and gardens are on the tour. This event is more about the homes than the gardens.
Gardens of Zionsville, 10 a.m. to 4 p.m., June 20. Includes summer tablescape ideas and an opportunity to bid on containers planted by area vendors. Number of gardens not specified.
Plainfield Garden Club Tour, June 20 and 21 features seven gardens.
11th annual Brownsburg Garden Tour, 10 a.m. to 5 p.m. Saturday, June 27 and 11 a.m. t 4 p.m., Sunday, June 28. Five gardens. Details: Tia Foundation, 317-852-3463.
Irvington Garden Tour, 1 to 5 p.m., June 28. Number of gardens not specified.
Woodruff Place Home and Garden Tour, June 27 and 28. Six homes and four gardens.
Now that you’re decked out and ready to go, here are some tips to make your tours enjoyable, comfortable and with the best etiquette.
- Wear comfortable shoes. You may be walking on muddy pathways or gravel walkways.
- Anticipate the weather and dress appropriately.
- Stay on the pathways. Wandering off the paths of a garden is like open a closed door in someone’s house.
- Do not take anything except notes and photos. No filching seeds, cutting flowers or taking snippets of plants allowed. There are horror stories from garden tour hosts who have had whole plants stolen from their gardens.
- Think green. Don’t leave any trash or litter.
- Allow time to enjoy the gardens. Remember some may be crowded, so be sure to take time to smell the roses.
Alliums adorn the spring garden. (C) Jo Ellen Meyers Sharp
Every spring, I’m always a bit surprised by the ornamental onions that pop up amid the oakleaf hydrangea in the front garden.
For weeks, I’m under the spell of daffodils, tulips, Virginia bluebells, snowdrops and other spring bulbs. But as these wane, perennials come to the fore, including columbines (Aquilegia), creeping phlox (P. subulata), woodland phlox (P. divaricata), soapwort (Saponaria) and lungwort (Pulmonaria).
I think the ornamental onion (A. giganteum) escapes my notice until it blooms because the foliage is camouflaged by the oakleaf hydrangea (H. quercifolia). These bulbs came from a friend and, of course, I always think of her when the alliums bloom.
Alliums are among the trendy plants right now, primarily because many of them bloom in mid summer, when there’s a little bit of a lull in the garden. Ornamental onion is planted in fall along with other spring blooming bulbs. Last fall, I planted 100 summer-blooming allium (A. carinatum pulchellum and A. sphaerochephalon) in large clusters in several garden beds.
In late May and June, you might be able to find nursery-grown pots of ‘Millenium’ or ‘Blue Eddy’ (A. senescens) at area garden centers.
Nodding onion (A. cernuum) is a native, ornamental plant that blooms in summer. However, unless you see this at a native plant sale, you’ll have or order and plant seeds for this allium.
Ornamental onion is in the same family as edibles – onion, chives, shallots and garlic. My biggest concern is being careful not to pull them out, thinking they are chives escaped from the herb bed or the invasive weedy, wild garlic.
The Glendale Branch of Indianapolis Public Library has IndyPL Seed Library, where you can check out seeds March through October.
Supported by Marion County Master Gardeners, Purdue Extension-Marion County, Fall Creek Gardens, Indy Urban Acres and others, most of the seeds are open pollinated, which means they are pollinated by wind, humans, birds or insects or other natural processes, making them genetically diverse. Many of the seeds also are heirloom.
Patrons can check out five packets per visit, or a total of 15 per season, to plant in their home gardens. You can harvest the seeds to return to the library or save them for your own garden next year.
The library also will conduct classes on sowing and saving seeds, gardening, water conservation and other topics.
A robin bathes in a bird bath. (C) Jarruda/canstockphoto.com
All over Indianapolis, birds are nesting, laying eggs, keeping them warm, hatching babies, keeping them warm and nourished until they take flight.
That’s a lot of work, but gardeners can help lighten the avians’ parental load.
Just like we’re all worried about bees in our landscapes, some of the same practices to support them apply for bird friendly gardens. For instance, reducing or eliminating the use of insecticides means that there will be bees and other bugs in your garden. Birds eat bugs. If no bugs, no food for birds.
If you were only going to do one thing in your landscape to attract birds, a water source would be the way to go. And though we may not think about it, bees and butterflies enjoy the occasional drink, too.
Confession time. A few weeks ago, I was changing the water in a shallow, glass bowl on a wrought iron stand in the front garden. To my horror, there were about a dozen bees drowned in the bowl. To prevent this from happening again, placed a thick and flat rock in the dish. The rock protrudes above the water level to provide bees, butterflies and birds a mini-landing pad and reduce the chance the bugs will drown.
I had a similar birdbath several years ago, only the glass bowl was much deeper. Again to my horror, there was a male goldfinch drowned in the bowl. So, be mindful of the depth of the birdbath.
A lot of us provide seed for birds, too. According to a 2014 Wild Bird Feeding Industry Research Foundation’s report, 39.4 percent, or 52.3 million U.S. households buy wild bird seed “at least sometimes.”
The average household spends $81.21 a year on wild bird seed to total $4.25 billion. U.S. households spent nearly $40 annually on feeders, or $2.06 billion, the foundation reported.
But what kind of seed should you buy? Depends on what kinds of birds you want to feed.
Finches, nuthatches, downy, hairy and red-bellied woodpeckers, wrens and chickadees are spotted regularly at my niger thistle feeder that hangs in the dogwood outside my living room window.
In the back, I have a feeder for sunflower or safflower seeds. I rotate them to discourage grackles and squirrels, which don’t like safflower seeds. Chipmunks, though, tend to eat any seed I put there. So do cardinals, mourning doves, chickadees, titmice and finches.
Place feeders where you can see them and enjoy their visitors. It’s best to put feeders in an open section of the garden where the falling seed won’t smother plants.
Lastly, create a good habitat in the landscape to provide birds shelter and protection from predators and safe places to nest and raise their young. Shade and ornamental trees, evergreens, flowering shrubs and perennials all fill that need.