Hypericum kalmianum 'Ames'
Ames Kalm St. John's Wort

Hypericum kalmianum ′Ames′ - Summer Habit

Family:

Hypericaceae (St. John's Wort Family) 7

Genus:

Hypericum (St. John's Wort St. Johnswort Aaron's Beard Wort, St. John's) 7

Plant Type:

Shrub 491

Hardiness:

USDA Zone 4 498

Deciduous / Evergreen:

Deciduous 809

Flowers:

Yellow (Unique, bright golden yellow petals with a large dome of similar-colored stamens; mid to late summer)

Foliage:

Green (Glossy blue-green summer foliage)

Fruit:

Brown (4-5 celled beaked capsule; moderately interesting; can persist into spring)

Ultimate Height:

2-3 feet

Ultimate Spread:

2-3 feet

Light Requirements:

Soil:

Adaptable, but must be well-drained

Range:

Cultivated origin

Diagnostic Characteristics:

Leaves (1-2" long) are opposite, simple, narrow, linear to lanceolate and dotted with resin glands. Stems are 4-angled. The showy flowers, borne in small cymes, are 1" across with 5 petals, 5 styles, and a large dome of numerous long stamens.

Special Characteristics:

Flowering Characteristics 436

Pest and/or Disease Resistant 98

Additional Information

Hypericum kalmianum 'Ames' is a compact, mounded deciduous shrub that produces attractive, interesting, bright yellow flowers in mid to late summer. 'Ames' is reported to have better winter hardiness than the straight species.