Monarda
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 A bumblebee on a Monarda flower
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About 16 species, including: |
Monarda (Bee Balm, Horsemint, Oswego Tea, or Bergamot) is a genus consisting of roughly 16 species of erect, herbaceous annual or perennial plants in the Lamiaceae, indigenous to North America. Ranging in vertical size from 1 to 3 feet (0.2 to 0.9 m), the plants have an equal spread, with slender and long-tapering (lanceolate) leaves; the leaves are opposite on stem, smooth to nearly hairy, lightly serrated margins, and range from 3 to 6 inches (7 to 14 cm) long. In all species, the leaves, when crushed, exude a spicy, highly fragrant oil. Of the species listed, M. didyma (Oswego Tea) contains the highest concentration of this oil.
[edit] Flowers, species, cultivars
Flowers of the Monarda genus are tubular, can be single or double, generally hermaphroditic, and appear in mid to late-summer in dense profusion. Flower sizes range from 2 to 4 inches (5 to 10 cm). Flower colors vary, with wild forms of the plant having crimson-red to red, pink and light purple. M. didyma has bright, carmine red blossoms; M. fistulosa -- the "true" wild bergamot -- has smokey pink flowers. M. citriodora and M. pectinata have light lavender to lilac-colored blooms and have slightly decreased flower quantities. Both species are commonly referred to as "Lemon Mint." There are over 50 commercial cultivars and hybrids, ranging in color from candy-apple red to pure white to deep blue, but these plants tend to be smaller than wild species, and often developed to combat climatic or pest conditions. I have seen "M.didyma" species up to 6 feet tall. Seed collected from hybrids -- as with most hybridized plants -- will not come true and reversion to true forms of the plants will occur with second generation seed.
[edit] Cultivation
The Monarda plants prefer full sun and moist yet well-drained soil. Plants established in partial shade or filtered sun have higher incidences of rapid horizontal spread and flower less. An aggressive plant in the Southeastern United States, Bergamots are not incredibly finnicky over soil conditions. Powdery mildew, rust, and (rarely) tobacco mosaic viruses disrupt established plants on occasion, but the plants are in general highly resistant to most wilts and viruses and are not easily damaged. Used most frequently in areas in need of naturalization, Monarda is often used in beds and borders to encourage and increase the appearance of hummingbirds, pollinating insects, and because of oils present in its roots is sometimes used to companion plant around small vegetable crops susceptible to subterranean pests. While seed should be stratified briefly before starting, seed may be cast directly or started in coldframes or greenhouses at soil temperatures approaching 70° Fahrenheit. Generally, propagation occurs by hardwood and softwood cuttings, root cuttings, layering, and division; the latter, quite frequently, is the most popular method out of necessity: the plant should be divided every 3 to 5 years to reduce spread, keep the central core of the plant healthy, preclude root rot, and improve air circulation about the foliage.
Monarda species are used as food plants by the larvae of some Lepidoptera species including case-bearers of the genus Coleophora including C. heinrichella (feeds exclusively on M. fistulosa), C. monardae (feeds exclusively on Monarda spp) and C. monardella (feeds exclusively on M. fistulosa).
[edit] Other information
The Bergamot of the Monarda species should not be confused with the popular flavoring used in Earl Grey tea. Dried leaves may be used for teas or aromatherapies, but the odor is subtly different from Citrus bergamia, the Earl Grey flavoring. For medicinal usage, Monarda has been known to treat headaches and fevers by infusing crushed leaves in boiling water.
