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Blues Festival® St. John’s Wort

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Blues Festival® St. John’s Wort (Hypericum kalmianum ‘SMHKBF’)An attractive and very colorful small shrub with eye-catching bright yellow sunburst flowers in mid summer over attractive blue-green foliage, and a neat, rounded form; a very versatile, low maintenance, native garden plant


Average Landscape Height:
3 feet
Average Landscape Width:
3 feet
Growth Rate:
Flower Color:
Flower Period:
from early to mid summer
Summer Foliage Color:
sea green
Minimum Light:
partial shade
Maximum Light:
full sun
Minimum Moisture:
Maximum Moisture:
Plant Form:
prune after flowering
Pollution Tolerance:
Flower Form:

Ornamental Features

Blues Festival® St. John's Wort has attractive bluish-green foliage with hints of powder blue on a plant with a spreading habit of growth. The narrow leaves are highly ornamental but do not develop any appreciable fall color. It is covered in stunning yellow pincushion flowers at the ends of the branches from early to mid summer. The flowers are excellent for cutting.

Landscape Attributes

Blues Festival® St. John's Wort is a multi-stemmed deciduous shrub with a ground-hugging habit of growth. Its relatively fine texture sets it apart from other landscape plants with less refined foliage.

Planting & Growing

Blues Festival® St. John's Wort will grow to be about 3 feet tall at maturity, with a spread of 3 feet. It tends to fill out right to the ground and therefore doesn't necessarily require facer plants in front. It grows at a slow rate, and under ideal conditions can be expected to live for approximately 20 years.

This shrub does best in full sun to partial shade. It prefers to grow in average to dry locations, and dislikes excessive moisture. It is considered to be drought-tolerant, and thus makes an ideal choice for a low-water garden or xeriscape application. It is not particular as to soil type or pH, and is able to handle environmental salt. It is highly tolerant of urban pollution and will even thrive in inner city environments. This is a selection of a native North American species.

Blues Festival® St. John's Wort makes a fine choice for the outdoor landscape, but it is also well-suited for use in outdoor pots and containers. Because of its spreading habit of growth, it is ideally suited for use as a 'spiller' in the 'spiller-thriller-filler' container combination; plant it near the edges where it can spill gracefully over the pot. It is even sizeable enough that it can be grown alone in a suitable container. Note that when grown in a container, it may not perform exactly as indicated on the tag - this is to be expected. Also note that when growing plants in outdoor containers and baskets, they may require more frequent waterings than they would in the yard or garden.