Hypericum elodes

RHS Plant Profile

marsh St John's wort

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Other common names

bog hypericum, marsh hypericum, eurinllys y gors

Synonyms

Elodes palustris
Hypericum palustre

Aquatic Bogs

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A marsh or submerged, creeping perennial to 15cm tall, with soft, densely woolly grey-green leaves to 1.5cm long. In summer it produces saucer-shaped, bright yellow flowers to 1cm across. Grow in a bog garden or at a pond margin

Position

Partial shade

Soil Types

Loam

Max Height

0.1-0.5 metres

Max Spread

0.1-0.5 metres

Size

Time to Maturity: 1–2 years
Max Spread: 0.1-0.5 metres
Max Height: 0.1-0.5 metres

Growing Conditions

Loam

Moisture: Poorly–drained
pH: Acid or Alkaline or Neutral

Position

Partial shade

Aspect: East–facing or West–facing
Exposure: Sheltered
Hardiness

Hardiness Ratings

All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees C) are shown in brackets

H1A: under glass all year (>15C)
H1B: can be grown outside in the summer (10 - 15)
H1C: can be grown outside in the summer (5 - 10)
H2: tolerant of low temperatures, but not surviving being frozen (1 to 5)
H3: hardy in coastal and relatively mild parts of the UK (-5 to 1)
H4: hardy through most of the UK (-10 to -5)
H5: hardy in most places throughout the UK even in severe winters (-15 to -10)
H6: hardy in all of UK and northern Europe (-20 to -15)
H7: hardy in the severest European continental climates (< -20): H5

Colour & Scent

Season	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family: Hypericaceae
Native to GB/Ireland: Yes
Foliage: Deciduous
Habit: Matforming
Potentially harmful: Fruit are ornamental - not to be eaten. Wear gloves and other protective equipment when handling. Pets: Fruit are ornamental - not to be eaten - see the HTA guide to potentially harmful plants for further information and useful contact numbers
Genus: Hypericum can be annuals, perennials, shrubs or trees, evergreen or deciduous, with usually paired leaves and showy yellow flowers with prominent stamens, followed by capsules, occasionally berry-like
Name Status: Correct
Plant Range: W Europe

How to Grow

Cultivation

Grow at the shallow margins of a muddy-bottomed pool, in dappled shade. See pond plants and bog gardens for further advice

Propagation

Propagate by division in spring

Pruning

No pruning required

Pests

Generally pest-free

Diseases

May be susceptible to a rust and honey fungus (rarely)