Focus on Flowers

Indiana Public Media

Focus on Flowers is a weekly podcast and public radio program about flower gardening hosted by master gardener Moya Andews.

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Thursday · 2 min
Black Bugbane
A good plant for shade that deer don’t usually like is black bugbane. The name is not attractive, but the plant is. It has dark foliage that contrasts well with its spikes of fluffy white flowers that are shaped like bottle brushes. It prefers woodland-type locations in shade or part shade, with some moisture in the soil. It grows in zones 3-9 and naturally repels insects. Plant it en masse and enjoy its fragrance in mid to late summer when it blooms. This plant grows slowly, though will eventually get to between 24-48 inches wide, so it makes a statement since it can attain a height of 48-70 inches as well. The flowers can be used in bouquets. This is also a plant that is useful if you have a rain garden or an area that stays wet a lot of the time. Plant it so the top of its root is 1 inch below the soil surface. Some parts of this plant are poisonous if eaten, which is why it is deer resistant, so wash your hands after handling it or be sure to wear gloves. If you have a problematic bed in deep shade this plant will still thrive. Its botanical name is Actea simplex or cimicifugia, but most people just call it bugbane. Not a pretty name for such an attractive plant.
October 15 · 2 min
Pincushion Flower
A plant that attracts butterflies to our garden is the pincushion flower. The botanical name is Scabiosa, and these plants usually have blue, white, or pink flowers. As their common name suggests, the shape of the flower resembles a pincushion as the central florets form a rounded shape. There are approximately 80 species in the genus, and some are annuals as well as biennials and perennials. These plants hate wet feet in the winter and thrive in full sun and well-drained, neutral-to-alkaline soil. Deadhead frequently to keep them blooming and divide them in the spring. If you do remember to consistently deadhead these plants in the summer, you will encourage them to bloom well into the fall since they do not mind some frost in the air. The blue Scabiosa caucasica, hardy in zones 4-10, is 18-24 inches high and as broad. The cultivar ‘Miss Wilmott’ has white flowers which are lovely in mixed bouquets, and the cultivar ‘Clive Greaves’ has especially lovely lilac-blue blooms. There is a large-sized pincushion-type plant, sometimes called Scabiosa gigantea, that can grow up to 6 feet tall with yellow flowers on long stems. It is actually Cephalaria gigantea, which grows easily from seed. Both the average-size and the large-size pincushion plants are lovely and rewarding to grow, and especially enhance cottage-type gardens.
October 9 · 2 min
A Surprising Uninvited Guest in Gardens
The genus Veronia has over 1000 species and is a member of the aster family. The name honors an English botanist, William Vernon. Many species of veronia are native to North and South America, and others come from Africa and Southeast Asia. Veronia is the Botanical name for the native ironweed that pops up and self-seeds in my Midwest garden. It is a tall plant and has clusters of dark purple flowers. Its full name is Veronia altissima. The dark green leaves are long and narrow and oval in shape. The plant is deer resistant and attracts hummingbirds and butterflies. It is a good cut flower to add to bouquets of blue mist flower, golden rod, zinnias, and marigolds that all bloom at the same time in my yard. It is native to the Eastern United States, north to New York state and Canada. It grows 3-7 feet tall and sometimes even higher, so it is a plant to look up to (literally), especially when one is cutting the flowers. It likes moist soil best but is not really fussy and blooms July through September/October depending on the weather. One often sees Veronia on roadsides and in fields and ditches. The wind disperses the seeds, which explains why it is a surprise when it appears in our gardens like an uninvited guest. At first, I used to cut it down thinking it was just a weed, which in a way it is. But the dark purple flowers now make me happy that it arrived uninvited.
October 1 · 2 min
Cut Them Back
Most perennials we should cut back in the fall. They don’t look good once it gets cold, so it is best to cut them to the ground and they will come back well next spring. Bearded iris should be cut to about 6 inches and remember to cut their flower stalks right to the ground as well. Also, bee balm (Monarda), especially if it has powdery mildew and seed heads that will fall and provide a multitude of new plants. Blackberry lilies also self- seed far too much unless they are cut back. Gaillardias also benefit from cutting back, and of course, fennel needs to be chopped right down. I cut my catmints back after their first bloom of the year so they will bloom another time, and then at the end of the season, I whack them down again. Columbine should be pruned right after the first frost and be sure to get rid of all leaves showing any leaf miner damage. Cut back coryadalis hard, and crocrosmia and daylilies too, to prevent diseases. A really good fall clean-up is essential to prevent the overwintering of pests and diseases. It also sets the stage for the garden’s spring display when the daffodils and other bulbs perform so well. So, cut down perennials that are past their peak in the cool days of fall, and in the spring next year you will be so glad that you did.
September 24 · 2 min
Tall Natives
Joe Pye Weed is a North American native and hardy in zones 4-9. It can grow up to 7 feet tall and is deer resistant. The genus name is Eupatorium and a common name is bone set. It has rounded clusters of pink fuzzy flowers during late summer and fall. The statuesque plants like full sun or part shade and will grow in average soil. Over time they grow to make clumps that are 3-4 feet wide. Propagate them by division. These are large plants so need plenty of room. Newer shorter varieties are available. For example, ‘Baby Joe’ is compact, so easier to site in small gardens. However, if you want a tall naturalistic planting, pair the tall Joe Pye Weed with golden rod and the purple flowering iron weed. A splash of sunshine yellow, such as large sunflowers or other species of helianthus, can make a tall naturalistic planting really pop when they bloom concurrently. Some purple aster could also add to this type of fall display, especially on the perimeter of a garden, or as a background in front of a line of trees or wooded area. It is a mix of color that shows up well from a distance, and the tall plants will tend to shade out stray weeds. Hollow-stemmed Joe Pye Weed ‘Fistulosum’ likes a moist site so is great for a rain garden.
September 17 · 2 min
Late Summer Color
As summer transitions into fall, we usually rely on mums and asters to give us color as the growing season wanes. But some other reliable bloomers are our native Culver’s Root, which has the botanical name Veronicastrum Virginicum and a good variety is ‘Fascination’. It is a tall plant, 36-48 inches high and 15 to 24 inches wide, so you need space for it and full sun and well- drained soil. However, it is easy care and does not need to be staked. It is hardy zones 3-9. Hyssops also bloom late, and there are pretty blue flowering ones as well as the lovely sunset hyssop with reddish pink blossoms, hardy zones 5-9, also native to the US. A low growing plant, plumbago, also provides beautiful blue flowers and then red foliage at the finale of the growing season. Let it creep along your driveway or spill over a wall and it will make you happy each fall. Japanese anemones are useful too, although the deer sometimes eat some of mine. I love their pink or pure white flowers on tall wiry stems, and they spread well. If you need an edging plant that blooms late, liriope is useful and produces either blue or white flower spires above strap-like leaves. Cut this plant to the ground with a weed eater either late winter or early spring and fresh leaves will return to charm you.
September 10 · 2 min
Glorious Glads
The name gladioli comes from the Latin word meaning sword because of the shape of the stiff sword-like leaves of the plant. Historically, there are early mentions of the plant, also referred to as “cornflag,” being a weed in European cornfields. In England, a native species grew only in the New Forest and the Isle of Wight. Gladiolus was first mentioned in England in 1578 in the garden list of William Mount. In 1597, Gerard wrote about two European species that were used as a poultice to draw out splinters and thorns from flesh. By the early 1600s, glads were being grown in gardens in England, and by the 1700s, glads were being imported to England and were quite common, with new species arriving frequently from South Africa. New varieties were also bred in both France and Germany in the 1800s. In 1907, an American called Mr. Kundera developed the first glad with ruffled edges. The variety Gladiolus primulinus from Victoria Falls, Mozambique is also called “Maid of the Mist.” Its hooded petals were thought to have evolved originally to protect the stamens and pistil from the spray from the falls. The yellow and orange colors of the glads we have today came from the genetic legacy of the “Maid of the Mist.”
September 3 · 2 min
Hummingbird Mint
Agastaches belong to the mint family, and, as a result, they all have square stems. They also have aromatic leaves and clusters of small flowers. Commonly called Mexican hyssops, they can be perennial but only a few are hardy as far north as zones 4 and 5. The tender species are grown as annuals in the north and are perennial in the south. Hyssops are easy going and make few demands. They grow in full sun or light shade and spread to make 2-3 foot clumps. Divide them in the spring, and they bloom all summer long delighting the hummingbirds but fortunately not the deer. There is a lovely gold-orange variety Agastache ‘Kudos Gold’ and a salmon-orange with rose and purple called ‘Apache Sunset’, and there is a more compact variety ’Little Adder’(zones 6 to 9) featuring spires of lavender and purple flowers on each stem. All hummingbird mints are upright in form and bloom all summer long. The bees, as well as the hummingbirds, enjoy them, and they are carefree and drought resistant once established. The flowers make welcome additions to bouquets, but the plants need good drainage. These are good plants for an informal colorful, easy-care planting that will show up well from a distance.
August 27 · 2 min
Helianthus annuus
The common sunflower goes by the botanical name of Helianthus annus. Extensive breeding has resulted in a great number of cultivars with yellow, orange, red, cream, white, and bi-color blooms, in many different sizes and flower shapes. The plants can grow 3-10 feet tall and so some need support. They are not temperamental plants, and most are native to Northern Mexico, Canada, and the United States. They are deer resistant and easy to grow and the seeds can be harvested for sowing in subsequent years. Plants are both annual and perennial, but all must have full sun and well-drained soil. Since their heads are mostly heavy, they prefer a sheltered location or un-staked plants can be easily blown over. Plant seeds 1 inch deep and 12-18 inches apart if they are annuals. Perennial varieties spread by rhizomes so need to be spaced 2-3 feet apart. Fertilizing at planting time helps the roots grow strong, which protects the plants from blowing over. Some gardeners plant annual sunflowers at two-week intervals from spring to early summer to ensure a succession of blooms. Mulch well to retain moisture and deter weeds. Do not fertilize much, because if the heads get too big, they are likely to break their stems. Divide perennial plants every three years. Since there are over 70 species, there are many types to choose from and experiment with. “Heli” means sun and “anthus” means flower.
August 20 · 2 min
No Deadheading
Many annuals need to be deadheaded to keep blooming all season. While snipping off the spent blossoms can hardly be described as hard work, it is easier not to have to remember to do this chore. For that reason, many of us try to buy annuals that do not need deadheading in order to re-bloom all season long and right into fall. One such plant is lantana, which is great in regions with cold winters where it can’t winter over and so doesn’t get aggressive. While I would never grow it in my native Australia where it is a terrible invasive, I do plant it in the Midwest garden where the deer leave it severely alone. Once established it flourishes with no help from me. I also love angelonias. The tall ones make good cut flowers and the shorter ones look pretty anywhere in the garden or in pots, and they also are deer resistant. They grow in full or part sun and come in pinks, whites, blues, and purples. And, how would we manage nowadays without begonias? They come with both green and dark-colored leaves, like both sun and shade, and are perfect in pots, boxes, hanging baskets, and beds, and stand up well in hot weather with less water than many annuals. My favorite is Dragon’s Wing Begonia, but most available varieties perform beautifully and require minimal attention. I also love the dark red coleus ‘Redhead’ for pots, and cuttings root easily in water, so one can have a great many. Any kind of coleus, as well as any annual salvia, is trouble-free and require no daily deadheading.
August 13 · 2 min
Shakespeare’s Plants
William Shakespeare included so many botanical references in his plays that there are about 175 mentions of flowers, fruits, grains, grasses, seeds, weeds, trees, spices, herbs, and vegetables in his works. There are also lots of comments about how to care for various items so he must have been knowledgeable in this area. Here are just a few examples you may recognize. Acorns, Garlic, and Figs As You Like It: Celia says, “I found him under a tree, like a dropped acorn.” A Midsummer Night’s Dream: Puck says, “All their elves for fear, creep into acorn-cups and hide them there.” Bottom advises, “Most dear actors, eat no onions or garlicke, for we are to utter sweet breath.” Titania suggests, “Feed him with apricots and dew berries, with purple grapes, green figs and mulberries.” Roses Henry VI: Somerset says, “Here in my scabbard meditating, that shall dye your white roses in a bloody red.” Violets Hamlet: Ophelia says, “I would give you some violets but they withered when my father died.” A Midsummer’s Night’s Dream: Oberon notes, “Where oxslips and the nodding violet grows…” The Tragedie of Cymbeline: Queen Cymbeline mentions, “The violets, cowslips and the primroses...” [Reference: Botanical Shakespeare by Gerit Quealy, illustrated by Sumie Hasegawa-Collins, (Harper Collins, 2017)]
August 6 · 2 min
Hot & Dry
I don’t have a watering system, so I get tired of watering when there are long periods of hot, dry summer weather. Here in the Midwest when it is over 90F, potted plants need watering twice a day and beds on slopes do too. It is a chore that makes me wish I had more drought tolerant plantings. A drought tolerant landscape does not mean zero watering, but it requires plants that can tolerate low amounts of water, even in extreme heat. Xeriscape plantings (“Xero” is the Greek root meaning dry) still need some watering during extended dry periods, but less than other plantings. While plants are getting established, they need deep watering to ensure good root growth. This is essential if you have sloping beds, as I do, and hillside plantings where water runs off. Sedums, lavenders, euphorbias, yuccas, yarrows, alliums, lilyturfs, salvias, oenotheras, santolinas, lobelias, gauras, coneflowers, and coreopsis are not big drinkers. Remember, too, that small plants need less water than tall plants, so grow lower varieties or keep plants pruned back when it is hot. Afternoon shade is also helpful.
July 30 · 2 min
Big & Showy Hibiscus
There are over 200 species of hibiscus, and they are beloved because of their big showy flowers and green, clean-looking foliage. They fall into three different major categories: tropical, perennial and hardy. The tropical hibiscus is native to Hawaii and comes in beautiful colors, and we often see them in photos tucked behind the ear of a beautiful model. The perennial varieties go dormant in winter and come back the following spring, but they often do not survive cold snaps. Hardy hibiscus come just in three colors—white, pink and maroon—and can be grown from seeds. Their blooms are large and showy and grow on small shrubs about 3-4 feet tall. A popular one in Midwest gardens is 'Blue Bird' and it is as lovely as its name. Rose of Sharon shrubs that grow up to 15 feet tall are old-fashioned members of the Hibiscus family, too, and they reliably bloom in late summer/early fall, year after year, in purple, white, and violet shades. While the older varieties self-seed everywhere, modern ones do not. So, try 'Cherry Cheesecake' with pink flowers with maroon centers, which grows 4-5 feet in full sun and also part shade. But before you buy any hibiscus, check to be sure it is hardy in your zone.
July 23 · 2 min
Woodland Poppy
Stylophorum diphyllum is our native celandine poppy that grows well in dappled shade in woodland conditions. It has cheerful yellow flowers and hairy seed pods. There are also two other woodland poppies that are native to China. All three species prefer moist soil and self-sow. They bloom in spring and intermittently into summer. Wordsworth even wrote a poem about this unassuming charmer: "Long as there’s a sun that sets, Primroses will have their glory; Long as there are violets, They will have a place in story: There’s a flower that shall be mine ‘Tis the little celandine. Comfort have thou of thy merit, Kindly, unassuming spirit! Careless of thy neighborhood, Thou dost show thy pleasant face On the moor, and in the wood, And in the lane; there’s not a place However mean it be, But ‘tis good enough for thee." Wordsworth obviously was as impressed with this versatile plant as we still are today. It is wonderful in shade gardens with companions such as forget-me-not, pulmonaria, ferns, bleeding heart, Virginia bluebells and other wild flowers.
July 16 · 2 min
Nurture the Birds
If you welcome birds into your garden you probably know that during the summer, water sources are very important to them. Place your birdbaths in the shade and clean them regularly to keep the water fresh. Have a few birdbaths in different parts of your yard, maybe one where you can see it through a window. Some types of birds prefer ground level water sources also, so even a plant pot saucer can serve during hot days. You don't need feeders during the summer, but water is crucial in times of drought. Also, some debris in a yard gives birds places to search for insects and grubs. Grow shrubs that produce seeds and fruit that will appeal to your feathered friends and plant a variety of natives that the birds enjoy during different times. For example, native viburnums such as those that attract birds as well as pollinators. They are host plants for the larvae of spring azure butterflies and hummingbird clearwing moths. The Serviceberry arborea has flowers to attract insects and small fruits late spring early summer that are eagerly consumed by cedar waxwings, bluebirds, and catbirds. They also have fall color, attract butterflies, and are deer resistant.
July 9 · 2 min
Cannas
Canna comes from the Greek word spelled "kanna," which means "reed," though the canna plant does not have narrow reed-like leaves. There are about 10 species in the genus, which has showy flowering plants that grow from tender rhizomes that can only be left in the ground over winter in zones 7-10. In other zones they must be dug and stored over the winter. Canna plants enjoy moist but well-drained soils in full sun. Plant the rhizomes 4-6 inches deep and space them 18-24 inches apart for best results. They can also be grown in large pots and stored in the pots in areas where the winter temperatures remain above 40F degrees. If dug for storage, do this after the first frost and store the rhizomes in vermiculite. The rhizomes can then be divided and replanted in the spring. If they shrivel during winter storage, spray lightly with water occasionally. Plants can be grouped and used to provide height and dramatic effect, in beds and borders, or used to conceal a fence or shed. When bloom is finished, cut the flower stalk right down. If you grow and enjoy these bold, showy plants, you will soon have a lot, as the rhizomes increase quickly. The original bright reds, yellows, and oranges, as well as the newer shades, pack quite a punch in the garden in high summer.
July 2 · 2 min
Oenothera
The common evening primrose is native to Virginia and was sent to England in the early 1600s, feeling quite at home there and has naturalized in several parts of Britain. The Missouri primrose was identified first in 1811. The evening primrose has both roots and leaves that are edible. The roots are sometimes eaten in France and some herbalists believed that the plant can be used medicinally for asthma and whooping cough. The botanical name for evening primrose, Oenothera, is from the Greek, which is interesting since all members of this plant family are natives of the New World. Oenothera fruticosa is hardy zones 3-8 and blooms in late spring, and its common name is sundrops. The nectar attracts butterflies and hummingbirds, and it grows 12-24 inches high. The pink evening primrose is Oenothera speciosa, and the flowers open in the evening and close in the morning. The white form is called 'Alba'. The Missouri evening primrose 'Missouriensis' has lemon yellow flowers on low red stems. It blooms from May through August and enjoys a dry soil. Divide these plants in spring or fall. Sometimes these primroses are aggressive growers, especially the pink ones, but they also often die out after a while. They are popular pass-a-long plants and easy to grow and are fun.
June 25 · 2 min
Billy Goat Weed
Many of us are familiar with ageratum, the low-growing annual with fuzzy flowers that are blue/lavender color. It is a member of the Ageratum genus that includes 43 species of annuals and perennials, most of which are native to warmer regions of the American continents. They have felted oval or heart-shaped leaves and clustered flower heads. They like full sun and moist well-drained soil, and a common name is floss flower. Another common name is billy goat weed, which suggest perhaps that goats may like them. I am guessing about that, as I have never seen a goat eating ageratum in my garden. Of course, I do not have any goats in my garden, even though I do have ageratum, as it pairs well with just about any other plant of any color. I also grow tall varieties ‘Bavaria’ and ‘Blue Horizon’, which are 18-20 inches tall and produce good cut flowers that dry well. Some species of ageratum can be pink and white as well as blue. Some even grow in light shade—for example, Ageratum altissima, which gets quite tall and has fluffy white blossoms. Some native varieties of ageratum winter over in our zone 6 and may become a pest as they self-sow prolifically. As long as you just grow varieties of this plant that are annual in our cold climate, however, it is well behaved. Otherwise, you may need to get some goats!
June 18 · 2 min
Baptisia australis
Blue false indigo, with the botanical name Baptisia australis, is a lovely shrub that blooms in the late spring in zones 3-9 in full sun or part shade. It grows about 4 feet tall and as wide and is drought tolerant and deer resistant and has blue/green foliage and blue flowers that resemble lupins. It was used by pioneers to dye cloth and is called 'false indigo' because its color is not as deep as true indigo. It has a big root system that cannot be divided. However, it grows easily from seeds. Gather the dark-colored seed pods in the fall and start new plants any time. This plant has been hybridized so that there are now white, purple, and yellow flowering varieties available and some that are smaller. They prefer full sun and good drainage to bloom well and can be planted as a hedge or as a background plant. The foliage stays grey/green and crisp and neat until late fall when it can be cut to the ground. I have mine in the front of a large flower bed, but if I was planting it now, I would place it at the back of a bed, as its flowering period is short, and it tends to self sow. However, the foliage always looks cool even on the hottest day of summer.
June 11 · 2 min
Dahlias
Native to Mexico, dahlias probably grew in Aztec gardens as they were already in cultivation when the Spaniards arrived. Francisco Hernandez, a botanist and physician to King Phillip of Spain, described them in a book published in 1651. But dahlias were not introduced to Europe until 1789 when seeds were sent from Mexico to the Royal Gardens in Madrid. The flower was named in honor of Dr. Dahl a Swedish botanist and pupil of Linnaeus. They were sent to Kew Gardens in England in 1798 by the wife of the British Ambassador to Madrid. By 1835, John Wedgewood, the founder of the British Horticultural Society, grew over 200 different varieties of dahlias. They were popular cut flowers with blooms of many sizes and colors. If a tuber has a sprout of more than 2" long, clip it off before you plant the tuber. Dig a hole 4-6 inches deep and place the tuber on its side and cover it with soil. Fertilizer is needed every 3-4 weeks and must be low in nitrogen. Do not water until sprouts are visible above the ground and then water deeply 3 times a week. Full sun is best, but plant in part shade if your temperatures go over 100F degrees. Dahlias bloom about 3 months after planting. Cut blooms that are 2/3 open and place the stems in hot (but not boiling) water in a plastic container and leave them in it until the water cools.

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