In short
- Site: sun or partial shade, fertile, humus-rich and moist soil.
- Blooms from July to September with ragged flower heads.
- An excellent nectar plant — a magnet for bees, bumblebees and butterflies.
- Prone to powdery mildew — needs moisture and air circulation.
- The aromatic leaves are suitable for herbal teas.
Botanical data
- Family
- Lamiaceae (Lamiaceae)
- Height
- 0.7–1.2 m
- Width
- 0.45–0.9 m
- Habit
- Upright
- Growth rate
- Fast
- Position
- Full sun, Partial shade
- Soil
- Humus-rich, Loamy
- pH reaction
- pH 6–7
- Moisture
- Moderate, Moist
- Bloom
- July–September
- Hardiness
- USDA 4a–9a
- Propagation
- By division, From cuttings
Characteristics
Forms a clump of upright, square stems 0.7–1.2 m tall that spreads by runners. The hairy, light-green leaves smell lemony and spicy when crushed, recalling the aroma of bergamot. The tubular, two-lipped flowers are borne in dense, ragged heads surrounded by colourful bracts.
Growing and care
Watering
Likes evenly moist soil. Drying out weakens the plant and markedly increases powdery mildew infection.
Fertilizing
A layer of compost in spring; on humus-rich soil extra feeding is usually unnecessary.
Planting
A moist, humus-rich site with good air circulation — looser planting limits mildew.
Pruning
Remove spent flower heads; in spring thin out the weakest stems for better air circulation and less mildew.
Companion plants
Good companions
Two flagship perennials of the prairie and pollinator-friendly border — together they attract bees and butterflies from summer into autumn.
Similar needs (sun, fertile soil) and summer-to-autumn flowering in warm tones complement the red of bee balm.
It extends the forage for pollinators into early autumn, when bee balm finishes flowering.
Bad companions
Both species are very prone to powdery mildew — planted close together in a poorly ventilated spot, they intensify infection in one another.
The evidence level indicates whether the relationship is backed by research, observation, or gardening tradition.
Diseases and pests
A white, powdery coating on leaves, shoots and buds. The leaves turn yellow, become deformed and drop prematurely. The coating develops on both sides of the leaf blade, is often clearly visible from above, and can easily be rubbed off with a finger — it is the superficial mycelium of an ectoparasite that draws nutrients from the epidermal cells by means of feeding structures (haustoria). At first single, round, white spots appear, which in time merge and cover the entire leaf surface and the young growth. Young leaves and the current season's shoots are the most susceptible; heavy infection causes them to pucker, stiffen and stop growing, and on buds it leads to deformation or death of the flowers. On the fruit of some species (gooseberry, apple, cucurbits) the coating leaves russeting or a corky skin. Towards the end of the season, small, dark fruiting bodies (chasmothecia, formerly called cleistothecia) — the pathogen's overwintering structures — appear within the coating. The disease affects many plants, including roses, oak, privet, lilac, cucurbits, cereals, grapevine, apple, gooseberry, phlox and coneflowers, with each of these hosts being infected by a specialised species of fungus.
AphidsSmall (1–3 mm) soft-bodied insects, green, black or pink, feeding in clusters on young shoots and the underside of leaves. They excrete sticky honeydew. The diagnostic feature that distinguishes aphids from other small sucking insects is the pair of siphunculi (tubular projections) at the rear of the abdomen together with a tail-like cauda; a single colony usually holds wingless forms (parthenogenetic females) alongside winged migrants that fly onto new plants in summer. In summer aphids reproduce parthenogenetically and viviparously over many generations, so the population builds up explosively; in autumn many species produce a sexual generation that lays overwintering eggs on the host, and host-alternating species move between a winter host (often a tree or shrub) and a summer host (a herbaceous plant). Feeding symptoms include curling, crinkling and distortion of young leaves, stunted growth, yellowing, and the shedding of buds and fruitlets. Abundant honeydew coats the leaves, and the sooty mould fungus that develops on it forms a black film which limits photosynthesis; the honeydew is fed on by ants, which in return defend the colony against predators. Aphids are also important vectors of plant viruses (mosaics among them), transmitting them from plant to plant even during a brief probing puncture.
Toxicity
| For whom | Level | Notes |
|---|---|---|
| Humans | None | — |
| Dogs | None | — |
| Cats | None | — |
History and origin
An eastern North American plant; its leaves were used for infusions by Native American tribes and settlers. After the Boston Tea Party the colonists used it to replace taxed tea, hence the English name Oswego tea. It reached European gardens in the 18th century as an ornamental and medicinal perennial.
Uses
For perennial borders, naturalistic and prairie gardens, pollinator-friendly plantings and herb gardens. The flowers and leaves are suitable as a cut flower and for aromatic teas.
Trivia
- It contains thymol and other essential oils with antiseptic properties; an infusion of the leaves was traditionally drunk for colds.
- In its homeland hummingbirds pollinate the red flowers of bee balm, while in our gardens it is chiefly bumblebees, bees and butterflies.
Frequently asked questions
Why is a white coating covering my bee balm's leaves?
It is powdery mildew — a common disease of this species, worsened by dryness and poor air circulation. It helps to keep the soil moist, to plant more loosely, to thin the stems, and to choose more resistant cultivars.
Is bee balm edible?
Yes. The aromatic leaves and flowers of Monarda didyma are edible and traditionally used for herbal teas (so-called Oswego tea) and to garnish dishes.
How do I keep bee balm's spread under control?
The plant spreads by runners. Simply divide the clump every 2–3 years — this rejuvenates the plant, limits its spread and improves its health.
Sources
- Plants of the World Online (POWO)Database (GBIF, POWO…)
- RHS — Monarda didymaInstitution / botanical garden
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