Horse balm, Richweed, Stoneroot
Collinsonia canadensis
Family: Lamiaceae
What it is like
A herb. It grows 120 cm high. It spreads 1 m wide. The stem is erect and square shaped. The leaves are smooth and without hairs. The leaves have coarse teeth. The leaves smell of lemon when crushed. The flowers are large and greenish-yellow. They are in loose groups.
There are about 5 Collinsonia species. It is used in medicine.
Where it is found
It is a temperate plant. It is best in rich, well-drained soils. It needs a protected partly shaded position. It is resistant to frost but damaged by drought. It suits plant hardiness zone 3-9.
Countries/locations it is found in
Australia, Canada, North America (country/location of origin), USA
How it is used for food
Caution: The leaves can cause vomiting.
Edible parts
Leaves, caution
How it is grown
Plants are grown from seeds.