Tanacetum macrophyllum (Waldst. & Kit.) Sch.Bip.

RHS Plant Profile

rayed tansy

Other common names

tansy chrysanthemum

Synonyms

Chrysanthemum macrophyllum
Achillea grandifolia misapplied

Herbaceous Perennial

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A bushy, rhizomatous perennial, to around 1m high in flower, with large, deeply divided, fern-like green leaves. Broad, dome-shaped heads of very small, daisy-like white flowers are produced in summer

Position

Full sun, Partial shade

Soil Types

Chalk, Clay, Loam, Sand

Max Height

0.5-1 metres

Max Spread

0.1-0.5 metres

Size

Time to Maturity: 2–5 years
Max Spread: 0.1-0.5 metres
Max Height: 0.5-1 metres

Growing Conditions

Chalk Clay Loam Sand

Moisture: Moist but well–drained or Well–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): H7

Colour & Scent

Season	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family: Asteraceae
Native to GB/Ireland: No
Foliage: Deciduous
Habit: Clump forming
Genus: Tanacetum can be annuals, evergreen or herbaceous perennials or sub-shrubs, with simple or pinnately divided leaves and solitary or clustered, terminal, daisy-like or button-like flower-heads
Name Status: Correct
Plant Range: Turkey, Transcaucasus

How to Grow

Cultivation

Thrives in moist but well-drained, humus-rich soils, but will tolerate a range of conditions including poor, dry soils where it will spread more slowly. May benefit from some early afternoon shade in warmer areas

Propagation

Propagate by seed or by division

Suggested planting locations and garden types

Cottage and informal garden
Mediterranean climate plants
Prairie planting
Wildflower meadow
Cut flowers
Flower borders and beds

Pruning

No pruning required; deadhead if seed is not required

Pests

May be susceptible to aphids and leaf and bud eelworms

Diseases

Generally disease-free