Wild bergamot is a member of the mint family, and it behaves like one: aromatic foliage, square stems, and a steady tendency to spread at the root. In a border that suits it, the trade-off is worth it. The shaggy lavender flower heads open across midsummer and are among the most reliable bumble-bee plants a Canadian gardener can grow.
Which pollinators it draws
The tubular florets reward insects with tongues long enough to reach the nectar, which is why bumble bees and certain long-tongued solitary bees work the heads so persistently. The same flower shape draws hummingbird moths and, in some plantings, hummingbirds. Shorter-tongued insects tend to visit the outer florets or rob nectar from the side.
Siting and spacing
- Full sun and average to dry soil; it dislikes soggy ground.
- Give it air movement — crowded, still plantings invite powdery mildew on the leaves.
- Space clumps generously and divide every few years to keep the centre vigorous.
Powdery mildew is the usual complaint with bergamot. It rarely kills the plant, but good spacing, morning sun, and not crowding the bed reduce how badly the leaves are affected.
The bloom window
Across much of its Canadian range, wild bergamot flowers through midsummer into early autumn. Removing the first spent heads can encourage a lighter second flush, though many growers leave the seed heads standing because finches feed on them and they hold winter structure.
Keeping it in bounds
Because it spreads by rhizome, wild bergamot is best where it can knit into a naturalistic planting rather than sit as a tidy single specimen. Lifting and dividing the clump in spring both controls its spread and refreshes the plant.