Native viburnums amplify fall color and biodiversity

Arrowwood viburnum displays a kaleidoscope of colors in e the fall that range from yellow to shades of red and purple.

Arrowwood viburnum displays a kaleidoscope of colors in e the fall that range from yellow to shades of red and purple.

Native viburnums are a beautiful and diverse group of plants with some of the most unusual and varied autumn coloration. They bloom in spring with a display of white flowers that offer plentiful support to early season pollinators.

The prolific flowering gives rise to a multitude of berries that are loaded with valuable fats for fall migrating birds. Eastern bluebirds, cardinals, brown thrashers, northern flickers, robins, vireos, grosbeaks and cedar waxwings are just a few of the birds that will visit our local viburnum species.

There are a handful of viburnums native to Florida, varying in size, growth habit, evergreen vs. deciduous, soil preference, and bloom times. All are prized in the landscape for their year-round beauty, wildlife value, and versatility. Whatever vision you have, there is a native viburnum species to suit it.

Here are a few noteworthy examples:

Walter’s viburnum, known botanically as Viburnum obovatum, hails from the Southeastern coastal plain, commonly found growing in thickets in moist settings. It is an evergreen shrub with a dense, rounded form, eventually developing into a small tree. Walter’s viburnum will spread by underground runners, so consider mowing around the plant as a preventative.

It blooms in early February, about the same time as redbuds, with slightly fragrant white flowers. If the flowers are pollinated, they will form berry clusters by late summer that shift from red to black when fully ripe. It generally requires moist soils, although it is tolerant of short periods of drought once established. The most important time to water is the first six to 12 months after planting to encourage deep roots.

Walter’s viburnum makes an excellent specimen for the bird garden, offering abundant fall fruit and dense foliage for nesting and cover. Plant as a hedgerow or mix with elderberry, American beautyberry, palmettos, or yaupon holly for a naturalized bird-friendly border.

Selected cultivars of V. obovatum have been bred to remain dense, small shrubs. ‘Mrs. Schiller’s Delight’ grows up to four feet tall and makes a nice formal boxwood substitute. ‘Best Densa’ can grow up to five or six feet tall creating a compact screen or hedge. Plant in light shade or full sun, although if you want profuse long-lasting blooms, full sun with moist soil is best.

Rusty Blackhaw, Viburnum rufidulum, is a small deciduous tree that is much more attractive than its namesake. It has lustrous, glossy leaves that reveal bronze-burgundy fall color and the buds are covered with rusty brown fuzz. With enough sun, they will produce clusters of white flowers in spring followed by berry-like fruits that ripen in October.

The fruit is green as it emerges, turning to red and then blue-black later in the season. Said to taste like raisins, the berries are edible and can be eaten raw, cooked, or made into jelly, though the birds and small mammals usually get to them first.

With enough sun, rusty blackhaw will produce clusters of white flowers in spring, `followed by berry-like fruits that ripen in October and turn to red and then blue-black later in the season

With enough sun, rusty blackhaw will produce clusters of white flowers in spring, `followed by berry-like fruits that ripen in October and turn to red and then blue-black later in the season

Rusty Blackhaws can be planted in full sun to light shade, however they develop their most attractive form when planted in sun. It tolerates a wide variety of soils as long as the site is well drained. The tree may sucker from the roots, however, mowing around them will prevent those underground runners. Plant as an understory specimen tree or use in a mixed border with dogwood, serviceberry, flowering plums, redbud, red buckeye, or fringe tree.

Arrowwood viburnum, Viburnum dentatum, is a deciduous shrub found in the coastal plain and Piedmont regions. Its long, straight stems were once used by Native Americans to make arrows, hence the common name. This species is highly adaptable to a variety of soil types in full sun to partial shade, so long as the soil doesn’t get too dry.

Glossy green leaves unveil a kaleidoscope of colors in fall that range from drab yellow to shades of red and purple. Its white flowers are not fragrant but appear in dainty flat tops through May and June. This shrub typically reaches 10 to 15 feet in height, with erect stems that arch outwards creating an overall loosely round habit.

Arrowwood produces many highly nutritious metallic blue berries that are essential in providing fuel for resident and migratory songbirds.

Arrowwood produces many highly nutritious metallic blue berries that are essential in providing fuel for resident and migratory songbirds.

Arrowwood has all the wildlife power of the above two species and more. It is a larval host plant for several moth species and a berry-producing machine. Juicy caterpillars are a preferred meal for nesting birds with hungry chicks and the metallic blue, berry-like drupes are essential in providing fuel for resident and migratory songbirds.

In fact, scientists have recently found that arrowwood fruits contain noticeably higher fat and carbohydrate concentrations when compared to other high-yielding berry plants.

Whether it’s for you or your feathered friends, you can’t go wrong with choosing a native viburnum. The more native shrubs we plant in our landscapes, the more food we’ll be providing for the birds we love to watch so much, in the form of berries and insects.

The yards with an abundance of berries will host an abundance of birds and aid in promoting a healthy ecosystem. Next time you are considering a new shrub or small tree for your landscape, I hope you give native viburnums a closer look.

Support Birds and Other Wildlife in Your Yard with Keystone Plants

What is a keystone plant? Keystone species have a disproportionately large effect on the abundance and diversity of other species, like insects, in an ecosystem. Without keystone plants, the local food web may fall apart. Keystone plants affect many species of animals, but pollinators and birds are my primary focus.

Insect scientist E. O. Wilson called insects, “the little things that run the world.” They provide many essential ecological roles that make it possible for humans to survive. Pollination of 87 percent of all the plants on the planet is a free service that insects provide. Can you picture a world where insects have been poisoned or habitat destroyed, and 87 percent of the world’s plants are gone? Insects also provide much of the planet’s pest control.

In North America we have driven three species of bumble bees to extinction (there are only 46 species). In Europe one third of grasshoppers, crickets and katydids are facing extinction. Flying insects in Germany have declined by 79 percent since 1989, and 46 species of butterflies and moths have disappeared completely. Globally insect abundance has been reduced by 45 percent since 1974. We can do our small, but important part to alleviate this problem by planting keystone plants in our yards.

Native narrow-leaf sunflowers. Photo by Donna Legare

Native narrow-leaf sunflowers. Photo by Donna Legare

Native sunflowers, goldenrods, asters, and blueberries are among the best keystone species that support pollinators. There are many species of goldenrod available to plant – wreath, wand, sweet and downy. Wreath goldenrod is even tolerant of shade and grows to only 2 feet with multiple stems – especially useful in the landscape with beautiful sprays of yellow flowers. Native asters on the market include blue wood aster, Elliott’s, Georgia, New England, and silk grass aster. Blueberries can include hybrids with large, sweet berries or the unique natives such as deerberry, highbush, Elliott’s and sparkleberry.

As striking as the October blooming native sunflowers are, be aware that they spread by both seed and runners and can overwhelm an area. In our yard, we try to contain them to the edges of the property so that we have room for other wildflowers. Narrowleaf sunflower does not get as tall as swamp sunflower, which can grow to eight feet. Blossoms are numerous and about two inches across.

The above species are great for specialist pollinators, like the southeastern blueberry bee, but the multitude of generalist pollinators will appreciate them also.

In North America, butterfly and moth caterpillars are the mainstay of most bird diets, especially when rearing their young, according to scientist Doug Tallamy, author of Nature’s Best Hope. Why focus on caterpillars? It is estimated that there are over 14,000 species of caterpillars. There are even more beetles (25,000 species) but caterpillars are easier to catch, soft, high in proteins and fats, juicy and easier for baby birds to swallow.

Photo: This white oak will grow to be a large shade tree and provide abundant insects for birds to eat. Photo by Vanessa Crisler

Photo: This white oak will grow to be a large shade tree and provide abundant insects for birds to eat. Photo by Vanessa Crisler

A family of 4-5 baby chickadees are fed 350-570 caterpillars a day by their parents. Over the nesting period of around sixteen days the parents deliver 6000 to 9000 caterpillars. The parents seldom fly more than 160 feet from the nest, finding these caterpillars primarily in trees.

All trees are not the same when it comes to hosting caterpillars. The best trees are considered the keystone species for bird abundance and diversity. In our region if you only have room for one more tree, let it be an oak. Since live oak, water oak and laurel oak are common here, I suggest planting a white oak or swamp chestnut oak for diversity. Oaks can harbor 390 species of caterpillars in North Florida which you will seldom see, but the birds will find them.

Other keystone species are black cherry (250), Chickasaw, flatwoods or American plum (250), river birch (172) maples (171), hickory (191) and pines (171). There are many others as well. Numbers of caterpillar species hosted for trees are listed by zip code on the National Wildlife Federation’s Plant Finder (see information box).

White oak in its autumn glory along with fringe tree in foreground. Photo by Vanessa Crisler

White oak in its autumn glory along with fringe tree in foreground. Photo by Vanessa Crisler

Shrubs, grasses, wildflowers and even weeds all host caterpillars, but trees are the best. Remember, regardless of what you plant for birds or pollinators, in most cases it should be native. American insects to a huge extent live only on American native plants. Many non-native flowering perennials are useful too because they produce nectar or pollen and are beautiful in the garden; just be sure that they are not invasive. Also, you can work keystone plants in around some of your established non-native plants like azaleas and camellias. The whole landscape does not need to be native.

Generally non-native trees such as crape myrtle, Chinese fringe tree or ginkgo, though pretty and not invasive, support zero to 3 species of caterpillars in North America and take up space that could be used for an American tree. Think of native trees as bird feeders.

Tallamy says if each American homeowner converted half of their yard to productive native plants, it would collectively restore 20 million acres to a semblance of a functioning ecosystem. How big is 20 million acres? It is bigger than thirteen of the country’s largest national parks combined! Tallamy would call it Homegrown National Park. Let us all do our part in providing for pollinators, birds, and healthy ecosystems.

Enjoy the bees and birds in your yard.

Information Box

www.nwf.org/nativeplantfinder - you can type in your zip code and find the keystone species for your area

www.audubon.org/plantsforbirds

www.apalachee.org – click on the Doug Tallamy presentation and then click Restoring the Little Things that Run the World to hear Tallamy explain it all. Also click on the Rob Williams Yard Tour for a local video on how to get started in Tallahassee.

Grow Your Own Salad and Stir Fry Garden This Winter

It is time to plant your winter garden! Each autumn, as the weather begins to cool, we plant our winter salad and leafy greens garden. Before long, we will no longer need to buy lettuce, collard greens, or kale from the grocery store because we will be picking it fresh and free from the garden. Winter gardens are easier than those planted in spring; there is less heat and fewer pests. You will be surprised how easy it is to grow lettuce and leafy greens in North Florida in winter and early spring.

Add compost and leaf mulch to your garden to increase organic matter content to improve soil health. Photo by Donna Legare.

Add compost and leaf mulch to your garden to increase organic matter content to improve soil health. Photo by Donna Legare.

Add compost and leaf mulch to your garden to increase organic matter content to improve soil health. Photo by Donna Legare.

Follow these steps:

  1. Select a mostly sunny spot; remove sod or weeds.

  2. Prepare the soil. Add finished homemade compost or mushroom compost and mix with existing soil. If your soil is mostly hard-packed clay, plant your salad garden in a container using a mix of good potting soil and compost.

  3. Your soil’s pH level should be between 5.5 and 6.8, which is ideal for growing most vegetables, leafy greens, and herbs. You may want to have a soil test done to see if you need to add dolomite lime. Read the UF/IFAS EDIS publication, Soil Sampling and Testing for the Home Landscape or Vegetable Garden (https://edis.ifas.ufl.edu/ss494), to learn more about soil sampling.

  4. Plant in rows or in small beds no more than three feet wide so the beds can be easily weeded, and the plants fertilized and harvested. Seed directly into the beds or set out transplants. We also add a thin layer of worm castings before sowing seed.

  5. Keep seed beds and transplants evenly watered. Pay attention to water needs.

  6. Once established, begin a fertilization regime. For the health of Wakulla Springs and other local bodies of water downstream from your garden, use only slow release type fertilizer with at least fifty percent of the nitrogen listed as water insoluble.

  7. Clip outer lettuce leaves as desired or harvest whole plants to thin the bed.

I recommend using organic fertilizer that builds the soil while feeding plants. After the seedlings have sprouted, we fertilize with a mixture of liquid seaweed and fish emulsion and water. Switch to a granular organic fertilizer, such as Plant-tone or Garden-tone, as needed.

Gardening in a garden shared with others can be very rewarding and can introduce you to new crops and gardening methods. Photo by Donna Legare.

Gardening in a garden shared with others can be very rewarding and can introduce you to new crops and gardening methods. Photo by Donna Legare.

Who is the “we” in this article? Gardening can be very satisfying to the lone gardener; however, I have enjoyed working on a three-family shared garden over the last 12 years. Our garden produces enough for all and the work is shared by all. Working in the garden together reminds me of a quilting bee, where everyone chats with each other as they work, producing a joint product.

Gardening in a garden shared with others can be very rewarding and can introduce you to new crops and gardening methods. Photo by Donna Legare.

When my son joined our garden family, he added a new element to our usual order, trying new varieties, different crops, and gardening methods. Last year he installed a three-foot-high metal bed, filling it three-fourths full of logs, twigs, and brush. Then he added a good bed mix. He planted leeks, shallots, and bulbing onions from seed and sugar snap peas along the edges. The pea plants draped down over the edges of the structure as they grew. As we thinned our lettuce and kale patches, we also thinned the leeks and onions and picked pea pods, which added lots of “free” flavor to the salads and stir-fries. He also sold me on radicchio and endive as flavorful additions to my salad.

If growing in a pot or small garden, you may decide to plant seedlings purchased from the nursery. The most economic way to grow a winter salad and leafy green garden is by planting from seed, eating the thinnings as the plants grow. Eventually, plants will be about eight inches apart and you can harvest outside leaves, though we usually have so much that we are able to keep pulling whole heads right up through the end of May.

When planting lettuce and leafy greens from seed, sprinkle the seed over the prepared bed. Then sprinkle worm castings or loose soil from the edges of the prepared bed over the seeds. Pat lightly but firmly so there is good contact between seed and soil. A rule of thumb is to cover a seed three times its diameter with soil. Lettuce and kale seeds are so small that a sprinkling of soil is all that is required to cover them. The pea seeds are poked individually into the soil to the proper depth. Be sure individual plants have enough room to grow. Planting information is given on seed packets.

Long range care of the garden

Most urban and suburban gardeners have trees in their yards. If you have trees anywhere near your garden, tree roots will invade, even in a raised bed. Once per year, we do a deep cut around each bed to cut invading tree roots. These roots will steal water and nutrients from your vegetables. We loosen the soil lightly, trying not to disturb earthworms and microscopic fungal mycelium and other beneficial organisms too much. We add organic matter to the top of each bed in fall and again in spring – either homemade compost, or bed mix with mushroom compost. We regularly mulch with leaves once the plants are up and growing.

In August, between the spring and fall garden planting, we plant cover crops of buckwheat or iron clay peas that are turned into the soil to decompose before fall planting.

The garden does not have to be big. A small three- by four-foot plot, or even a large pot, will suffice. I also sometimes plant lettuce and other winter vegetables in between dormant butterfly plants in our butterfly garden over the winter. Get started today; you can do this. Enjoy!