Pollinator Gardening for the South: Creating Sustainable Habitats
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About this ebook
*Covers USDA hardiness zones 6, 7, 8, and 9, including twelve southern states
*Explains what makes pollinators happy—bees, for sure, and many others, great and small
*Brings science and art together in gardens of all types, including urban, food, container, community, school, and large-scale gardens
*Provides step-by-step instructions for choosing locations, preparing soil and garden beds, selecting the best plants, considering seasonality in your garden design, managing your garden throughout the year, and much more
*Richly illustrated with photographs, design plans, and handy charts and lists
Danesha Seth Carley
Danesha Seth Carley is associate professor of horticultural science at North Carolina State University and director of the Southern Integrated Pest Management Center.
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Pollinator Gardening for the South - Danesha Seth Carley
Introduction
The Southern Life of Bee Enthusiasts
The American South is a truly special place. Honestly, we would say this even if we were not sitting outside in February with temperatures in the mid-70s and the sweet scent of flowering apricot (Prunus mume) and saucer magnolia (Magnolia × soulangeana) wafting across the garden to us. With its rich history and unique plant life, including stately longleaf pines, Spanish moss–covered live oaks, and enormous multitrunked magnolias—not to mention the food: sweet tea, chicken and buttermilk waffles, drop biscuits with molasses, chicory coffee—the South is a special place. The South is our home; this is where our passions have rooted us. This is what we know best. We want to share our excitement and knowledge with you so that you learn to love pollinator gardening here in the South as much as we do.
We are horticulture professors and, of course, plant nerds. We are dedicated to beautifying and protecting green space in our urban environment. We are also bee nerds. We love plants and bees. And to be perfectly honest, butterflies, beetles, and even flies are pretty darn cool, too. In this book we want to share our love of plants, design, green space, and pollinators large and small with gardeners with all levels of experience. This book is for anyone with a few yards of patio or garden space, and curiosity and concern for the synergy between gardens and pollinators. It is for home gardeners and landscape professionals. It is for master gardeners and students of horticulture and landscape architecture. If you are not already a self-proclaimed plant, bee, and/or bug nerd, then keep reading so we can turn you into one.
It made sense for us to write a book that was focused on the South; one of us has lived in the South for over twenty years, and the other was born and raised in the South. We are southerners through and through. The South is in our blood. It is here in the South that we garden, raise our kids, and help shape future leaders in the fields of horticultural science and landscape architecture.
The reason we finally decided to take time away from our gardens and our classrooms to write a book was that, when searching for science-based recommendations for pollinator habitats, we found that most advice was based on anecdotes rather than grounded in science. As southerners who understand the importance of design and implementation based on evidence, we wanted to select plants that are proven to be good for pollinators and we wanted to protect bees and butterflies, beetles and flies. So we decided to write this book: it’s the book we wanted to read. It will give you the most up-to-date information based on research-driven science and current thinking.
Often books and catalogs are disappointingly basic or too broad in their plant recommendations, so they do not provide appropriate recommendations for the Southeast (for example, they may recommend only sedums for green roofs, which are excellent for hot, dry locations—but the Southeast is also wet and humid, which isn’t ideal for sedums, which prefer a much drier climate). One book may give wonderful advice for honey bees but neglect all the other bees; another may have beautiful photographs but provide precious little information on planting design strategies or even ideal plant choices; another may try to cover only native plants for only native bees in the whole great United States. (Whew, that was a lot to take in.) So we’ve focused on the plants and pollinators commonly found in the South.
The South comes with its own set of challenges. It spans four USDA hardiness zones (eight if we include Florida). Throughout the year, the hottest states in the United States are concentrated in the South Central region and southeastern corner of the country. During every season, Florida, Louisiana, and Texas are consistently among the top four of the nation’s hottest states, based on statewide average temperatures. Florida is the warmest state on average year-round, which is why it has its own hardiness zones. Annual precipitation amounts are on the rise, and rain tends to come in intermittent deluges, yet in the South we still experience droughts during our prime growing seasons. As we said, the South is a special case. Bless its heart.
This book, while appropriate for a scientific audience, will also appeal to concerned landscapers, home and hobby gardeners, and even entire garden clubs. Our goal is to take science from our classrooms into community halls and teach everyone enough science and practical knowledge that they too can become informed protectors of pollinators. Champions of green spaces. Bee garden gurus. When we say that anyone can be a pollinator champion and pollinator-friendly gardener, we mean you! No matter how small your garden plot or how large and unruly your yard, you can make a place for pollinators and help to save the bees (and butterflies, and flies, and beetles), one pollinator-friendly plant at a time.
Danesha, the scientist, is a sustainable urban ecologist, while Anne, the artist, is an experienced landscape designer. Together we have nearly five decades of experience. A scientist and an artist. We approach problem-solving differently, and our areas of expertise complement each other very well. We have designed and built numerous pollinator habitats together, and those gardens are better for having had both of our perspectives. This book, too, is better for having both our points of view. It’s a perfect blend of art and science, with some pretty fabulous photos and ideas thrown in.
It is our hope that gardeners across our beautiful, biodiverse, history-rich, humid South will pick up our book and be inspired to get outside and select plants that both please humans and nourish pollinators. Anyone can be a pollinator gardener: all you need is the desire to garden and the willingness to get your hands dirty. So grab a glass of freshly squeezed lemonade, a big slice of hummingbird cake, and get ready to dig in.
1
Pollinators Make the World Go ’Round
With so many environmental problems challenging our planet, bad news and shocking headlines abound—so much so that it can feel overwhelming and it’s hard to know what to tackle first. Many people want to help, to just do something, but they don’t know how. It is not uncommon for homeowners and landscape professionals to come to us seeking advice on how to help the environment, especially when it comes to pollinator conservation and protection. The good news is that creating a pollinator-friendly garden or setting aside a bee-positive habitat is possible at any landscape scale, and we are here to help! But first, we need to set the stage by providing some important information about why everyone should plant a pollinator habitat. Much of this may be familiar to you, but some of it may not. Come with us as we cover the basics of why pollinators are important, some fun facts about different pollinators, and, finally, how you can plant a garden or create a habitat that is pollinator friendly.
The Importance of Pollinators
There are more than 250,000 species of flowering plants (angiosperms), and approximately 80 percent of these plants rely to some extent on almost as many species of animal pollinators to meet their reproductive needs. It is in large part due to this relationship that angiosperms were able to rapidly diversify between 90 million and 130 million years ago. This mutualism between flowering plants and insects such as bees, flies, and wasps is essential to the ecosystem. These critters carry pollen from plant to plant, which promotes outcrossing, aids in genetic recombination, and ensures sexual reproduction in those plants (seed set, meaning the plants produce seed, and fruit set, the process in which flowers become fruit). The pollination of flowering plants also increases the aesthetic appeal of landscapes and contributes to wildlife habitats. Who doesn’t enjoy seeing butterflies flitting lazily about a garden or bees buzzing busily from flower to flower?
The insects that pollinate plants are as diverse as the plants they pollinate. Here, clockwise from above, are a honey bee on a coneflower, a hoverfly on yarrow, and a male long-horned bee on a black-eyed Susan.
In addition to contributing to beautiful landscapes, insect pollinators are responsible for contributing to the yield of 75 percent of the world’s food crops. Put another way, between $235 billion and $577 billion worth of food relies on direct contributions by pollinators. While this is a great way to understand their importance if you are an economist, it may be easier to think of it this way: pollinators affect 35 percent of the world’s crop production, increase yields of many leading food crops worldwide, and contribute to the making of many plant-derived medicines. Very broadly, one out of every three bites of food you eat is a result of some form of facilitated animal pollination.
We can thank pollinators for many of the bountiful crops we rely on, including blueberries, apples, pumpkins, brassicas (such as cabbage and broccoli), peppers, cantaloupes, squash, many beans, apricots, peaches, cherries, mangoes, grapes, olives, carrots, cucumbers, sunflower seeds, kiwis, lemons, various nuts, nutmeg, and tea. Think about the breakfast you ate today. Whole-grain toast with strawberry jam: thanks, bees. Orange juice: thanks, bees. Coffee with just a splash of cream: thanks, flies and bees. The coconut, raisins, and vanilla in your granola: thanks, flies and bees. And thanks, bees, for enhancing the output of the sustainably grown cotton used to make the shirt on your back. We could go on and on, but you get the idea. Pollinators are of critical importance to our way of life.
A Brief History Lesson on Managed Bees
For over 3,500 years, humans have understood that bees and the pollination services they provide are important to agriculture. However, it was not until the mid-1700s that Joseph Gottlieb Kölreuter, a German professor of natural history, first demonstrated that insect visitation was a necessary for seed production in several economically important fruits, vegetables, and ornamental flowers. Once humans better understood the role of insect-aided pollination and subsequent fruit set, we were able to enhance crop productivity and exploit pollination for our own purposes, both on a small scale and commercially.
In general, only a few pollinator species are actively managed. Think of them as tiny livestock: kept in a box, kept in large quantities, bought and sold commercially, and moved from place to place seasonally. Of these, the darling of agriculture, Apis mellifera, the European honey bee (also called the western honey bee), is the most actively managed pollinator worldwide. Originally from Eurasia, it has been the primary managed pollinator throughout history, with records dating back to ancient Egypt. Managed honey bee colonies were later transported around the world and arrived in North America with European colonists in the 1600s. It was not until 1862 that modern apiculture was born in North America. L. L. Langstroth, a hobbyist beekeeper and minister in Philadelphia, originated the concept of confined bee space,
a place where bees could be kept, moved, and managed. In fact, the Langstroth hive is named after L. L. Langstroth, who, in 1852, invented and subsequently patented his design. This hive has revolutionized modern beekeeping with its movable frame and top-bar hives, which let beekeepers safely manage the colonies and harvest honey without hurting the bees. This constructed creation and concept of managing bees ultimately allowed the large-scale commercial beekeeping and honey industry that exists today.
Beekeepers actively manage honey bees in hives, which come in many sizes, colors, and styles. The boxlike hives shown here are traditional.
In the United States, honey bees are trucked around the entire country to overwinter in sunny southern climates such as Florida and then move north and west as demand dictates. Moving bees is labor intensive and stressful for beekeepers and bees alike. In the spring, hundreds of hives wrapped in netting are packed onto tractor trailers, which typically carry between 400 and 500 hives each, secured with tie-downs, and sent on their way. They typically start in the South—first in citrus groves in Florida, then melon fields throughout the region, blueberry and caneberry (blackberries and raspberries) fields from Georgia to the Carolinas—and move north, to the apple orchards and fields of squash, cucumber, and pumpkin along the East Coast, and eventually up to cranberry bogs in Massachusetts and Maine.
Raspberry (left) and blueberry (right) plants both need bees to pollinate their flowers before they can set fruit.
Growers and farmers pay commercial beekeepers to place hives in blossoming fruit and vegetable fields in order to enhance crop yields, thereby making their farms more profitable. The service itself is not free; costs range from $10 to $180 per acre, depending on the number of hives, the season, the crop, and the weather. Apple producers in Virginia may pay around $65 per colony this year (2020), compared with $100 for pumpkin farmers in the same area. These hives for hire
are used to pollinate more than one hundred commercially grown crops and are highly valued by farmers for their role as essential pollinators and by the hive owners for their production of wax and honey. In the South, in addition to honey bees, several species of bumblebees (Bombus spp.) are also actively managed, mainly for the pollination of greenhouse tomatoes. In 2012, managing honey