Species large-flowered St. John's wort
Large-flowered St. John's Wort (Hypericum kouytchense) displaying its glossy foliage and yellow flower with long stamens

large-flowered St. John's wort

Hypericum kouytchense

The large-flowered St. John's wort (Hypericum kouytchense) is an impressive and easily recognizable perennial shrub native to East Asia. It has elongated leaves and bright yellow flowers, up to 3 cm in diameter, that bloom from June to September. The foliage has a tendency to take on a bronze color in cold temperatures, and it produces black fruit in the fall. This resistant and drought tolerant plant is an excellent low-maintenance addition to any garden, and it will bring a unique beauty to any shady spot.

Cycle:

Perennial

Watering:

Average

Propagation:

Cutting,Division,Layering Propagation,Seed Propagation,Stem Propagation

Hardiness Zone:

6 - 9

Flowers:

Yellow Flowers

Sun:

Full sun,part shade

Leaf:

Yes

Leaf Color:

green

Growth Rate:

High

Maintenance:

Low

Drought Tolerant:

Yes

Salt Tolerant:

Yes

Invasive:

Yes

watering

Large-flowered St. John's Wort should be watered every 10-14 days, depending on the type of soil and amount of sunlight it is exposed to. If planted in a well-draining soil, water more frequently, as the soil will dry out faster. Water the soil until it is saturated, and then allow it to slightly dry out before watering again. During the hottest parts of the summer, or if your soil drains quickly, water every 7 days. During cooler or wetter times during the year, you can extend the watering schedule to 14 days.

sunlight

Large-flowered St. John's wort (Hypericum kouytchense) does best in full sun, although it can tolerate partial shade. It needs at least 6 hours of direct sunlight each day and should be placed in a spot that is free from obstruction. In hot climates, it may need some protection from the sun during the hottest time of day to prevent scorching. When grown indoors, it needs to be placed near a window where it can receive a minimum of 6 hours of direct sunlight daily. Otherwise, it may not flower or produce fruits.

pruning

Large-flowered St. John's wort (Hypericum kouytchense) should be pruned twice a year, once in the spring and once in the fall. In the spring, prune the plant to remove dead wood, and to encourage new growth and flowering. Cut the stems back to 2 or 3 buds from the previous year's growth, without cutting the crown of the plant. In the fall, prune the plant to thin out the stems, increasing airflow and light penetration into the center of the plant. This will also encourage bushier growth when new stems emerge in the spring. Avoid pruning in summer, as the plant is dormant and may not respond well to drastic pruning.

Season

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

Large-flowered St. John's wort typically starts flowering in June.

Hardiness Map