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Summary

Bloom Color: Yellow. Main Bloom Time: Early summer, Late summer, Mid summer. Form: Spreading or horizontal.

Physical Characteristics

Hypericum calycinum is an evergreen Shrub growing to 0.3 m (1ft) by 1 m (3ft 3in) at a fast rate.
See above for USDA hardiness. It is hardy to UK zone 6. It is in leaf all year, in flower from June to September, and the seeds ripen from September to October. The species is hermaphrodite (has both male and female organs) and is pollinated by Insects. The plant is self-fertile.
Suitable for: light (sandy), medium (loamy) and heavy (clay) soils, prefers well-drained soil and can grow in heavy clay and nutritionally poor soils. Suitable pH: mildly acid, neutral and basic (mildly alkaline) soils and can grow in very alkaline soils.
It can grow in full shade (deep woodland) semi-shade (light woodland) or no shade. It prefers dry or moist soil and can tolerate drought.

UK Hardiness Map US Hardiness Map

Synonyms

Habitats

Woodland Garden Sunny Edge; Dappled Shade; Shady Edge; not Deep Shade; Ground Cover;

Edible Uses

None known

References More on Edible Uses

Medicinal Uses

Plants For A Future can not take any responsibility for any adverse effects from the use of plants. Always seek advice from a professional before using a plant medicinally.

None known

References More on Medicinal Uses

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Other Uses

Dye

A good ground cover plant[182, 208], succeeding in the heavy shade of trees and in dry shade[190, 200]. Very vigorous, it can swamp out small plants. For the densest cover plants should be cut to ground level each April[197]. A yellow-orange dye is obtained from the flowers.

Special Uses

Ground cover

References More on Other Uses

Cultivation details

Landscape Uses:Border, Cascades, Erosion control, Ground cover, Specimen. Easily grown in any reasonably good well-drained but moisture retentive soil.[1] Succeeds in dry soils[200] and in chalky soils[11]. Grows well in heavy clay soils. Succeeds in sun or shade but flowers better in a sunny position[11]. Grows well even in the shade of tall trees[1, 20, 31]. Tolerates poor soils and also drought when it is established[184]. A very cold-hardy plant, tolerating temperatures down to about -25°c[184]. A very ornamental but very invasive plant, spreading by means of stolons[1, 182]. Seldom sets seed in Britain, probably due to our wet autumns[182]. Plants are often afflicted with rust disease[182, 200]. Plants in this genus are notably resistant to honey fungus[200]. Special Features: Attractive foliage, Not North American native, Invasive, Naturalizing, Attracts butterflies.

References Carbon Farming Information and Carbon Sequestration Information

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The PFAF Bookshop

Plants For A Future have a number of books available in paperback and digital form. Book titles include Edible Plants, Edible Perennials, Edible Trees, and Woodland Gardening. Our new book to be released soon is Edible Shrubs.

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Propagation

Seed - sow spring in a greenhouse and only just cover the seed. Germination usually takes place within 1 - 3 months at 10°c. When they are large enough to handle, prick the seedlings out into individual pots and grow them on in the greenhouse for their first winter. Plant them out into their permanent positions in late spring or early summer, after the last expected frosts. Cuttings of half-ripe wood 10 - 12 cm with a heel, July/August in a frame. Plant out in the following spring[200]. Cuttings of mature wood, 12 - 17cm with a heel, October/November in a sheltered position outdoors. Plants root by the spring. Good percentage[78]. Division in spring as new growth commences[78]. Very easy, larger clumps can be replanted direct into their permanent positions, though it is best to pot up smaller clumps and grow them on in a cold frame until they are rooting well. Plant them out in the spring.

Other Names

If available other names are mentioned here

Native Plant Search

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Found In

Countries where the plant has been found are listed here if the information is available

Weed Potential

Right plant wrong place. We are currently updating this section. Please note that a plant may be invasive in one area but may not in your area so itâ€™s worth checking.

Conservation Status

IUCN Red List of Threatened Plants Status :

Related Plants

Latin Name	Common Name	Habit	Height	Hardiness	Growth	Soil	Shade	Moisture	Edible	Medicinal	Other
Hypericum androsaemum	Tutsan, Sweet-amber, St. Johnswort	Shrub	1.0	5-10	F	LMH	SN	DM	0	1	3
Hypericum ascyron	Great Saint John's Wort	Perennial	1.5	3-7		LMH	SN	M	1	2
Hypericum attenuatum		Perennial	0.6	-		LMH	SN	DM	1	0
Hypericum bellum		Shrub	1.0	5-9		LMH	SN	M	0	1	2
Hypericum erectum		Perennial	0.6	5-9		LMH	SN	M	1	1
Hypericum forrestii		Shrub	2.0	4-8		LMH	SN	M	0	0	2
Hypericum hypericoides	St. Andrews Cross	Shrub	1.2	5-9		LM	SN	DM	0	2
Hypericum japonicum	Matted St. John's Wort	Annual/Perennial	0.5	-		LMH	SN	MWe	0	2
Hypericum kamtschaticum		Perennial	0.3	-		LMH	SN	M	1	0
Hypericum monogynum		Shrub	0.7	8-11		LMH	SN	M	0	2
Hypericum patulum	Goldencup St. Johnswort	Shrub	1.0	6-7	M	LMH	SN	M	0	1	3
Hypericum perforatum	St. John's Wort, Common St. Johnswort	Perennial	0.9	3-10		LMH	SN	DM	2	4	2
Hypericum sampsonii		Perennial	0.6	8-11		LMH	SN	M	1	2

Growth: S = slow M = medium F = fast. Soil: L = light (sandy) M = medium H = heavy (clay). pH: A = acid N = neutral B = basic (alkaline). Shade: F = full shade S = semi-shade N = no shade. Moisture: D = dry M = Moist We = wet Wa = water.

Hypericum calycinum - L.