St. John's worts 'Rowallane' (Hypericum 'Rowallane')

St. John's worts 'Rowallane'

Bearing bowl-shaped, deep-yellow flowers, St. John's worts 'Rowallane', named for the garden in which it was discovered, is an ideal ground cover for cottage and informal gardens. St. John's worts 'Rowallane', a hybrid of Hypericum leschenaultii and H. hookerianum "Charles Rogers," continues to delight during its flowering season from early to late summer.

Scientific classification

Nances, spurges, willows and allies

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Perennial

Lifespan

Shrub

Plant Type

Semi-evergreen

Leaf type

15 - 32 ℃

Ideal Temperature

Care Guide for St. John's worts 'Rowallane'

Twice per week

Water

Full sun

Sunlight

15 - 32 ℃

Ideal Temperature

Garden Soil

Soil Type

Water: St. John's worts 'Rowallane' is drought-tolerant but cannot tolerate waterlogged soil. For the first year, provide 25 mm of water weekly. In rainy areas, no extra watering is needed after the first year, as natural precipitation suffices. Overwatering may lead to root rot and leaf wilting.

Fertilize: St. John's worts 'Rowallane' requires minimal fertilization. After initial planting, additional fertilization is unnecessary unless slow growth is evident. In such cases, apply a low-concentration balanced compound fertilizer with a 10-10-10 NPK ratio.

Pruning: St. John's worts 'Rowallane' produces vibrant yellow flowers and reaches heights of up to 6 feet. Prune in early spring by removing dead wood and thinning crowded branches to improve air circulation and light. Regular pruning enhances bloom production and maintains desired shape, ensuring robust growth.

Propagation: St. John's worts 'Rowallane' propagation methods include seeding, cuttage, and plant division. For seeding, use a sand bed at 10-12°C and maintain moisture. For cuttage, select 10-15 cm soft branches with leaves. Maintain soil moisture and transplant when seedlings reach 20 cm, moving outdoors at 70 cm.

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