Ames Kalm St. Johnswort Hypericum

Bright Summer Blooms
Compact Native Texture
Pollinator Friendly Color

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Ames Kalm St. Johnswort Hypericum

Sunlight
Can grow in a range from full sun to partial shade. They need at least six hours of direct, unfiltered sunlight per day.
Watering
Regular watering schedule for the first six months. Once established, rainwater should be sufficient.
Fertilizing
Should not need any extra fertilizer unless your entire lawn and garden have problems and needs regular fertilizing.

Ames Kalm St. Johnswort Hypericum

Ames Kalm St. Johnswort Hypericum is a compact flowering shrub valued for bright yellow summer blooms, narrow blue-green foliage, and a tidy rounded habit. This native-style hypericum adds pollinator-friendly color to sunny borders, slopes, foundations, rock gardens, and naturalized plantings.

Why choose Ames Kalm St. Johnswort Hypericum?

Choose Ames Kalm St. Johnswort Hypericum for easy summer color and refined texture in a manageable shrub form. Its golden, star-like flowers appear during the warm season, creating a lively contrast against slender foliage. The plant’s compact, mounded habit works well in low borders, mass plantings, foundation edges, and naturalistic designs. It is especially useful where gardeners want a durable shrub that blends ornamental appeal with a native plant look.

Key Characteristics

Botanical Name: Hypericum kalmianum ‘Ames’
Common Name: Ames Kalm St. Johnswort Hypericum
Plant Type: Deciduous to semi-evergreen shrub
Growth Habit: Compact, rounded, multi-stemmed shrub

Ames Kalm St. Johnswort Hypericum Additional Information

Ames Kalm St. Johnswort Hypericum produces showy yellow flowers in mid to late summer, often with a bright tuft of stamens that gives each bloom a sunny, textured look. The narrow, blue-green to green foliage creates a fine, clean appearance through the growing season and pairs well with ornamental grasses, coneflowers, asters, evergreens, and other flowering shrubs.

This hypericum is typically grown as a small deciduous shrub in colder climates, though it may hold some foliage longer in milder conditions. Its compact form makes it useful for low hedges, front-of-border groupings, erosion-prone slopes, cottage gardens, rock gardens, and native-inspired plantings. Flowers are attractive to bees and other pollinators. Prune lightly after flowering or in late fall to maintain shape, removing only what is needed to keep the plant tidy and naturally rounded.

Planting & Care

1. Planting: Plant Ames Kalm St. Johnswort Hypericum in full sun to partial shade with well-drained soil. Set the root ball level with the surrounding soil, backfill firmly, and water thoroughly after planting.

2. Watering: Water consistently during the first growing season to help establish strong roots. Once established, it performs well with average moisture and appreciates supplemental watering during extended dry periods.

3. Mulching: Apply a 2–3 inch layer of mulch around the root zone to conserve moisture and reduce temperature swings. Keep mulch pulled slightly away from the stems.

4. Pruning: Prune lightly after flowering or in late fall to shape the shrub and remove damaged or crossing stems. Avoid cutting the plant hard to the ground unless directed by local growing conditions.

Related Resources

FAQs

How big does Ames Kalm St. Johnswort Hypericum get?
Ames Kalm St. Johnswort Hypericum is a compact shrub, generally suited to low borders, foundation edges, and mass plantings. Mature size can vary by climate, soil, and pruning.
When does Ames Kalm St. Johnswort Hypericum bloom?
It typically blooms in mid to late summer with bright yellow flowers, adding warm seasonal color after many early-flowering shrubs have finished.
Is Ames Kalm St. Johnswort Hypericum evergreen?
In colder northern landscapes, it is usually grown as a deciduous shrub. In milder climates, it may behave as semi-evergreen and hold some foliage longer.
Where should I plant Ames Kalm St. Johnswort Hypericum?
Plant it in sunny to lightly shaded areas with well-drained soil. It works well in borders, rock gardens, slopes, foundation plantings, and naturalized shrub groupings.

Shipping Details

Estimated Shipping Time: Most orders ship immediately. As noted on the website, some items are seasonal, and may only ship in spring or fall. Once your order is shipped, you’ll receive an email with a tracking number.

Amount of Order	Shipping Charge
Local Delivery	FREE SHIPPING
Non-Local Delivery	Varies based on UPS shipping

Thrives
Full Sun
Flowering

Mature Height	Medium: Up to 4 ft
Mature Spread	0-5 ft
Growth Rate	Moderate, Slow
Botanical Name	Hypericum kalmianum 'Ames'
Bloom Time	Mid Summer
Deer Resistant	Usually
Family	Hypericaceae
Flower Color	Yellow/Orange
Hardiness Zones	4, 5, 6, 7
Light Needs	Full Sun, Partial Sun
Maintenance	Low
Size	#3 Container

Map of the United States with all states outlined and filled in dark greenli

Growing Zones 4-8 Outdoors

(Hardy down to -30)

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Mature Spread	5-10 ft	0-5 ft	0-5 ft	0-5 ft	5-10 ft	5-10 ft
Growth Rate	Fast, Moderate	Fast	Moderate	Fast, Moderate	Fast	Moderate
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Deer Resistant	Usually	No	Usually	Usually	Usually	Usually
Flower Color	Pink	Red	White	Pink	White	White
Family	Caprifoliaceae	Rosaceae	Adoxaceae	Hydrangeaceae	Rosaceae	Adoxaceae
Hardiness Zones	4, 5, 6, 7, 8	4, 5, 6, 7, 8, 9	3, 4, 5, 6, 7, 8	3, 4, 5, 6, 7, 8	4, 5, 6, 7, 8	3, 4, 5, 6, 7, 8
Light Needs	Full Sun	Full Sun	Full Sun, Partial Sun	Full Sun	Full Sun	Full Sun, Partial Sun
Maintenance	Low	Low	Low	Low	Low	Low