Drosera filiformis var. filiformis

RHS Plant Profile
thread-leaved sundew

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Synonyms

Drosera filiformis subsp. filiformis

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An insectivorous perennial to 25cm tall, forming a rosette of slender, upright, leaves which are covered in red, glandular hairs. These secrete a sweet, sticky substance to trap and digest insects. In summer white flowers are produced

Position

Full sun

Soil Types

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

Loam Sand
Moisture
Poorly–drained
pH
Acid

Position

Full sun
Aspect
East–facing or South–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)
H3

Colour & Scent

Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family
Droseraceae
Native to GB/Ireland
No
Foliage
Deciduous
Habit
Tufted
Genus
Drosera, commonly known as the sundews are one of the largest genera of carnivorous plants. They are perennial or (more rarely) annual, upright herbaceous plants forming either prostrate or upright rosettes, and can live for up to 50 years.
Name Status
Correct
Plant Range
E North America

How to Grow

Cultivation

Under glass, grow in mix of equal parts fertiliser-free peat substitute and sand, in full light with shade from hot sun. The compost should be kept continually moist in the growing season by standing the container in a tray of soft (lime-free) water, such as rainwater. During the winter, plants enter a period of dormancy so keep plants moist, not sodden. Outdoors grow in wet, naturally peaty, acidic, nutritionally poor soil in full sun. See Carnivorous plant cultivation

Propagation

Propagate by sowing seed as soon as ripe, or by root cuttings when dormant

Suggested planting locations and garden types

  • Houseplants
  • Patio and container plants
  • Conservatory and greenhouse

Pruning

Trim off faded top growth in late autumn

Pests

Generally pest-free

Diseases

Generally disease-free