Have you ever heard this term before? I thought not. That's the current, though obscure, family name for what many readers already know as legumes. The legume family is enormous and spans the globe. It includes some trees and many ornamental and food plants. In the average backyard garden, legume means green beans and spring peas. To the more curious gardener, legumes include many unique beans to flirt with in the kitchen. Hummingbirds love the flowers of some tall legumes.
Easy to grow and nutritious, beans and peas are standard fare for many American home gardens. Like any self respecting vegetable, fresh legumes can contribute an array of nutrients to your recommended daily intake. Fresh beans and peas are not earning "superfood" gold medals, but don't pass them by. A cup of green beans gives you about 30 percent of the vitamin C you need daily, for example1. Beans and peas are super easy to plant and use. Let's find the right legume for your garden.
Relatively large seeds make beans and peas easy to plant. Plant them an inch or so deep, and watch the sturdy seedlings unfurl from the soil surface days later. Unique root biology makes legumes less needy of highly fertile soil. Like most vegetables, legumes grow best in full sun and neutral soil. Beans and peas grow quickly. Best planting dates will vary by type of bean and garden location. Some legumes can take a bit of chill. Others need warm soil and sunny days to produce a crop.
The part we eat as a vegetable is an immature seed pod, or barely mature seeds. If left on the plant too long, most peas and beans become starchy. Those starchy beans can be shelled, cooked and eaten just like dried beans you've used in soup. One caution: mature beans of some legumes have toxins. Kidney and lima beans, for example, must always be boiled before being eaten. This rule also applies to some novelty tropical beans too. So while you may freely eat English peas and standard young green beans right off the plant, use caution with other bean varieties. Do not start grazing on other legumes unless you have determined that they are not toxic. Ornamental sweet peas for example, have toxins. Please refer to "Beans! Beans! The Poisonous Fruit! by Lois Tilton for detailed information on bean toxins.
These chill tolerant types can be planted in early spring. Aim for six to eight weeks before your last frost date. Peas will need a light fence to climb. Some gardeners use long trimmings from shrubs as "pea brush." Stick branches in ground alongside the peas as a temporary support. Spring pea crops may be finished by early summer. Consider following the peas with a warm season crop such as cucumbers. Also consider picking some young tender pea leaves and blooms to add to your green salad.
Plant these after the last frost date. Many varieties and hybrids of green beans (snap or string beans) are in cultivation. Gardeners may choose beans by size, shape, color and most importantly by growth habit. A bush bean grows a plant about knee high for easy picking, with many beans maturing in a short time span. Pole beans make vigorous vines that need to climb up a string or pole. Native American gardeners used living cornstalks as bean poles, making for a very productive garden. Pole beans usually produce more beans than bush types overall. Lima beans can be either bush or pole type as well. Limas take longer to grow so are less used in northern gardens.
Southern gardeners have long enjoyed cream peas, crowder peas, and various "southern" peas. Some northern gardeners can grow them, too. These are hot weather grown beans. Plant them in well-warmed soil, a month after the last frost date. The pods grow until well filled, and then the beans or peas inside are shelled out and cooked. Southern Living offers more insight into various field peas from the kitchen perspective.
Adventurous garden catalogs offer excursions into the land of unusual legumes.
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Footnotes and resources
Beans and Peas, James R. Myers, W. Michael Colt, and Marilyn A. Swanson, http://www.cals.uidaho.edu/edcomm/pdf/PNW/PNW0495.pdf1. http://nutritiondata.self.com/facts/vegetables-and-vegetable-products/2341/2
2. WebMD, Edamame (SOY) Side Effects & Safety, http://www.webmd.com/vitamins-supplements/ingredientmono-975-Edamame%20%28SOY%29.aspx?activeIngredientId=975&activeIngredientName=Edamame%20%28SOY%29
3. Lost Crops of Africa:Volume II: Vegetables, http://books.nap.edu/openbook.php?record_id=11763&page=191
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