Species St. John's wort
Topas St. John's Wort (Hypericum perforatum 'Topas') showcasing green leaves and bright yellow flowers on red stems

St. John's wort

Hypericum perforatum 'Topas'

St. John's wort (Hypericum perforatum 'Topas') is an aromatic flowering herb with plenty of sunny yellow blossoms. It typically grows to about 12-18 inches tall and produces a pleasant but spicy scent. This variety is bright and colorful, and offers beautiful texture to any garden space. Its cheerful flowers bloom from spring to fall and are the perfect addition to brighten up a landscape. It also attracts bees and butterflies to your garden. This plant can be planted in sunny or semi-shaded areas and prefers soils that are moist and well drained. St. John's wort 'Topas' is a low-maintenance and drought tolerant perennial, making it an ideal addition to any garden.

Cycle:

Herbaceous Perennial

Watering:

Average

Propagation:

Cutting,Layering Propagation,Division,Seed Propagation,Tissue Culture

Hardiness Zone:

3 - 8

Flowers:

Yellow Flowers

Sun:

Full sun,part shade

Leaf:

Yes

Leaf Color:

green

Growth Rate:

Low

Maintenance:

Low

Drought Tolerant:

Yes

Salt Tolerant:

Yes

Care Level:

Medium

watering

St. John's wort (Hypericum perforatum 'Topas') should be watered regularly but infrequently, usually every 7 - 14 days. You should provide deep, thorough waterings each time, providing 1 inch of water if rainfall is not sufficient. You should water in the morning as the cooler air and hours of sunshine will help the soil dry out and the plant to take up the moisture. Make sure to check if the soil is dry up to 2 inches deep before watering again.

sunlight

St. John's wort (Hypericum perforatum 'Topas') prefers full sun, which means at least 6 hours of direct sunlight each day. It should be placed in an area that receives sunlight from early morning to late afternoon and the amount of shade it can tolerate varies depending on how long and intense the sunlight is. When there is strong, direct sunlight for 8 hours or more, St. John's wort can tolerate less shade. The plant grows best when the sun is at its brightest, between 10am and 4pm. In areas with a mild climate, St. John's wort could perform well with afternoon shade, but if the climate is hot and sunny it should not receive any shade.

pruning

For pruning St. John's wort (Hypericum perforatum 'Topas'), it is best to wait until late winter or early spring. Pruning should only be done when the plant is dormant and no new growth is visible. When pruning is complete, ensure any clippings are disposed of to prevent any new growth. Reduce the size of the plant by removing any dead or dying branches, leaves and flowers that are no longer productive. Cut back stems that have grown too large, making sure to leave plenty of healthy, green growth behind. Avoid cutting too much as this can put a strain on the plant. Lastly, thin out the foliage for maximum health and air circulation.

Season

Fall
Winter
Spring
Summer
Sep
Oct
Nov
Dec
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Starts Flowering

St. John's wort typically starts flowering in June.

Hardiness Map