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Perforate St Johns Wort in the GardenTags plant encyclopedia

Hypericum perforatum

 

Perforate St John's Wort

Perforate St John's wort is a herbaceous perennial plant with extensive, creeping rhizomes. The leaves are yellow-green, with scattered translucent dots. The dots give the leaves the 'perforated' appearance. The flowers are coloured bright yellow with conspicuous black dots and appear in broad cymes at the ends of the upper branches, between late spring and early to mid summer.

Contributed by @helmside

 
plant Features
  • Perforate St Johns Wort likes full sun

    Full sun

  • Perforate St Johns Wort likes occasional watering

    Occasional watering

  • Perforate St Johns Wort is full frost hardy: 5f (-15°c)

    Full Frost Hardy: 5F (-15°C)

  • Perforate St Johns Wort likes free draining

    Free draining

 
plant information

Common name

Perforate St John's Wort

Latin name

Hypericum perforatum

type

Deciduous trees or shrubs

family

Hypericaceae

ph

5.0 - 8.5 Acid - Neutral

  • Light

    Perforate St Johns Wort likes full sun

    Full sun

  • Frost

    Perforate St Johns Wort is full frost hardy: 5f (-15°c)

    Full Frost Hardy: 5F (-15°C)

  • Soil

    Perforate St Johns Wort likes free draining

    Free draining

  • Water

    Perforate St Johns Wort likes occasional watering

    Occasional watering

Plant & bloom calendar

  •  
    Best time to plant
  •  
    When the plant will bloom

full grown dimensions

The size of a fully grown Perforate St Johns Wort is 1.00meters x 1.00meters 1.00 M 1.00 M

Hypericum perforatum

Perforate St John's wort is a herbaceous perennial plant with extensive, creeping rhizomes. The leaves are yellow-green, with scattered translucent dots. The dots give the leaves the 'perforated' appearance. The flowers are coloured bright yellow with conspicuous black dots and appear in broad cymes at the ends of the upper branches, between late spring and early to mid summer.


Flowering Season

From Early Summer TO Early Autumn

The 3 inch flowers are borne singly and are produced in succession from early summer through to early autumn.

 

Planting

From Late Autumn TO Late Winter

Plant out in any well drained, fertile soil from autumn to late winter in a sheltered border in full sun. As these shrubs are late-flowering, it is advisable to give them wall protection in northern gardens.

 

Propagation by cuttings

From Early Spring TO Late Summer

Take heel cuttings, 3-4 inches long from half-ripe lateral shoots preferably with a heel at any time between spring and late summer. Insert into equal parts of sand and peat in a propagating case at a temperature of 16C. When rooted, pot the cuttings singly in 3 inch pots of John Innes No 1 and overwinter in a cold frame. The following spring, pot on into 4 inch pots and plunge outdoors until planting out in autumn.

 
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