Lysimachia thyrsiflora

RHS Plant Profile

tufted loosestrife

Synonyms

Naumburgia thyrsiflora

Bogs Herbaceous Perennial

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A native perennial wildflower found in Yorkshire and Central Scotland. The spreading rhizomes produce upright stems up to 60cm tall, bearing paired, narrowly oval, pointed leaves and small, yellow, star-shaped flowers in dense, fluffy clusters in summer

Position

Full sun, Partial shade

Soil Types

Clay, Loam

Size

Time to Maturity: 2–5 years

Growing Conditions

Clay Loam

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

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: Primulaceae
Native to GB/Ireland: Yes
Foliage: Deciduous
Habit: Clump forming
Genus: Lysimachia are herbaceous or evergreen perennials with simple leaves and star-shaped, cupped or bowl-shaped flowers in terminal racemes or panicles, or solitary in leaf axils
Name Status: Correct
Plant Range: NE Asia

How to Grow

Cultivation

Naturally found in marshes, ditches and canals, needing permanently moist soil in a sunny or partially shaded spot

Propagation

Propagate by division

Pruning

No pruning required. Can be cut back at the end of the season

Pests

Generally pest-free

Diseases

Generally disease-free