Gentiana asclepiadea (Willow Gentian, Milkweed Gentian)
Botanical Information
Family | Gentianaceae |
Genus | Gentiana |
Species | asclepiadea |
Category | Perennials |
Details
USDA Hardiness Zone | 7b - 8a |
USDA Hardiness Ref. | |
Canadian Hardiness Zone | 7b |
Canada Hardiness Ref. | |
RHS Hardiness Zone | H5 (Observed growing well in H7) |
RHS Hardiness Ref. | |
Temperature (°C) | -15 to -10 |
Temperature (°F) | 5 - 14 |
Height | 0.5 - 1 m |
Spread | 0.1 – 0.5 m |
Growth | Medium |
Flowering Period | July, August, September |
Description and Growing Information
General Description | Gentiana asclepiadea is a herbaceous perennial with arching stems, lance-shaped leaves and dark blue trumpet flowers. |
Cultivation | Grow in shade, in moist but well-drained, humusy soil. Avoid chalky soils. Will tolerate more sun in cool, damp summer climates. |
Pests | No serious pests or diseases of note. |
Notable Specimens | Montreal Botanic Garden, Montreal, Quebec, Canada. Lanhydrock Gardens, Cornwall, England. |
Photographs
![A mature plant growing well in the Montreal Botanic Garden, Montreal, Quebec, Canada. A mature plant growing well in the Montreal Botanic Garden, Montreal, Quebec, Canada.](photos/gentiana-asclepiadea-willowleaf-gentian-form.jpg)
A mature plant growing well in the Montreal Botanic Garden, Montreal, Quebec, Canada.
![Gentiana asclepiadea. Leaf, Lanhydrock Gardens, Cornwall, England. Gentiana asclepiadea. Leaf, Lanhydrock Gardens, Cornwall, England.](photos/Gentiana-asclepiadea-lf.jpg)
Gentiana asclepiadea. Leaf, Lanhydrock Gardens, Cornwall, England.
![Gentiana asclepiadea. Flower, Lanhydrock Gardens, Cornwall, England. Gentiana asclepiadea. Flower, Lanhydrock Gardens, Cornwall, England.](photos/Gentiana-asclepiadea-flw.jpg)
Gentiana asclepiadea. Flower, Lanhydrock Gardens, Cornwall, England.
![Gentiana asclepiadea. Autumn form, Lanhydrock Gardens, Cornwall, England. Gentiana asclepiadea. Autumn form, Lanhydrock Gardens, Cornwall, England.](photos/Gentiana-asclepiadea-frm.jpg)
Gentiana asclepiadea. Autumn form, Lanhydrock Gardens, Cornwall, England.
Awards
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