Gratiola officinalis

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Other common names

hedge hyssop, hyssop

Herbaceous Perennial Bogs
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A rhizomatous perennial to 40cm tall forming clumps of upright stems bearing linear to lance-shaped leaves with toothed margins and small, white summer flowers

Position

Full sun, Partial shade

Soil Types

Clay, Loam, Sand

Max Height

0.1-0.5 metres

Max Spread

0.1-0.5 metres

Size

Time to Maturity
2–5 years
Max Spread
0.1-0.5 metres
Max Height
0.1-0.5 metres

Growing Conditions

Clay Loam Sand
Moisture
Poorly–drained or Moist but well–drained
pH
Alkaline or Neutral or Acid

Position

Full sun Partial shade
Aspect
East–facing or South–facing or West–facing
Exposure
Exposed or 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
Plantaginaceae
Native to GB/Ireland
No
Foliage
Deciduous
Habit
Clump forming
Genus
A genus of rhizomatous perennial, marginal pond plants with narrow green leaves and small, delicate white to pale pink flowers
Name Status
Correct

How to Grow

Cultivation

Grow in moisture-retentive soil in full sun or partial shade; suited to boggy conditions and for pond margins

Propagation

Propagate by seed or by division

Suggested planting locations and garden types

  • Cottage and informal garden
  • Wildlife gardens
  • Flower borders and beds

Pruning

Cut back after leaves have died down in autumn

Pests

Generally pest-free

Diseases

Generally disease-free