I learned this firsthand a few years ago when we were expanding the pollinator borders here at SpruceShake. I planted a single, small pot of red Bee Balm. By mid-summer, it had exploded into a massive clump of fireworks-shaped blooms, and the hummingbirds were fighting over it daily. However, by the following spring, I discovered its dark secret—it had aggressively spread through its underground runners and was trying to choke out my delicate coneflowers.
Bee balm is a stunning, aromatic perennial from the mint family, but it demands respect and a bit of discipline. In this guide, we are going to cover how to grow these vibrant flowers, how to prevent them from taking over your garden, and how to defeat their biggest enemy: powdery mildew.
Quick Answer: Is Bee Balm Invasive?
Bee balm is native to North America, so it is not technically “invasive” in the ecological sense. However, because it is in the mint family, it is an aggressive spreader. It uses fast-growing underground rhizomes to take over garden beds. To keep it contained, you must dig up and divide the plant every 2 to 3 years.
How to Control Bee Balm Growth
If you love the flowers but want to keep the plant from bullying its neighbors, you need a control strategy. Here is how I keep my Monarda in check.
1. Physical Root Control (Dividing)
The most effective way to manage bee balm is by digging it up and dividing the root ball every 2 to 3 years, preferably in the early spring before it sprouts heavily. Use a sharp spade to slice the clump into thirds. Replant the healthiest outer sections and throw away (or give away) the old, woody center.
The perfect tool for slicing through tough perennial roots:
2. Plant in Containers
If you absolutely do not want to deal with pulling up runners every spring, treat bee balm exactly like you would culinary mint: plant it in a large container. It thrives in pots as long as you water it frequently.
Popular Bee Balm Varieties
There are several distinct varieties of bee balm, each offering a different color palette and growth habit.
- Wild Bergamot (Monarda fistulosa): This is a tall, native perennial featuring pale lavender-pink blooms. It is highly adaptable and often found in natural meadows. Its leaves are highly aromatic and historically used in medicinal teas.
- Red-Flowered Bee Balm (Monarda didyma): This is the classic, bright red showstopper. It has a slightly more compact growth habit than Wild Bergamot and is the absolute favorite of passing hummingbirds.
- Lemon Bee Balm (Monarda citriodora): This variety is prized for its strong citrus scent and is often used as a culinary herb.
Pro Tip: Look for Dwarf Varieties
If you have a small garden, seek out modern dwarf cultivars like the ‘Balmy’ series or ‘Pardon My Purple’. They only grow 12-15 inches tall and are much less aggressive than the wild species.
Growing and Caring for Bee Balm
Planting Requirements
Bee balm is hardy in USDA zones 3-9. It prefers full sun (at least 6 hours a day) to produce the most blooms, though it will tolerate partial shade, especially in hotter southern climates.
It prefers rich, consistently moist soil that drains well. Amend your planting hole with plenty of organic compost to give the roots a healthy start.
Watering and Deadheading
Water the plants regularly, aiming to keep the soil consistently moist but never soggy. During extreme summer heatwaves, bee balm will dramatically wilt if it gets too dry.
To keep the plant blooming all summer long, practice deadheading. As soon as a flower begins to fade and turn brown, snip it off. This redirects the plant’s energy into creating new flower buds instead of producing seeds.
The Biggest Problem: Powdery Mildew
If you grow bee balm, you will eventually deal with powdery mildew. It looks like someone dusted the leaves of your plant with white flour. While it rarely kills the plant, it looks terrible and causes the leaves to curl and drop.
How to Prevent and Treat It:
- Spacing: The #1 cause of powdery mildew is poor airflow. Space your plants at least 18 to 24 inches apart.
- Watering: Always water at the base of the plant. Never wet the leaves, especially in the evening.
- Treatment: At the first sign of white spots, apply an organic copper fungicide or Neem oil to prevent the spores from spreading to the rest of your garden.
Stop Powdery Mildew before it ruins your foliage:
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Final Thoughts
Despite its tendency to wander where it isn’t invited and its battle with powdery mildew, Bee Balm is absolutely worth planting. Very few plants offer such vibrant, alien-like blooms while drawing in an endless parade of beneficial pollinators. Give it some space, divide it when it gets greedy, and enjoy the show!
Frequently Asked Questions
Is bee balm toxic to dogs or cats?
No, bee balm (Monarda) is completely non-toxic to dogs, cats, and horses. However, because its leaves contain highly aromatic oils, eating large quantities of it could give a pet a mild, temporary stomach ache.
Can bee balm be grown in containers?
Yes, growing bee balm in containers is actually an excellent way to prevent its aggressive roots from taking over your garden. Choose a large pot (at least 12 to 15 inches deep) to accommodate the root system, and ensure it has drainage holes.
What are good companion plants for bee balm?
Bee balm pairs beautifully with other sun-loving, pollinator-friendly perennials. Great companion plants include purple Coneflowers (Echinacea), Black-Eyed Susans, Lavender, and Russian Sage. These plants all share similar water and sunlight requirements.
Is bee balm deer resistant?
Yes! Because bee balm is a member of the mint family, its leaves are heavily scented with essential oils. Deer and rabbits generally despise the strong, oregano-mint fragrance and will leave the plant completely alone.
