Baptisia 'Blue Towers'

RHS Plant Profile
false indigo 'Blue Towers'

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Herbaceous Perennial

An herbaceous perennial, forming a clump to around 1.2m high, with upright stems bearing leaves divided into three clover-like leaflets. Tall clusters of lavender-blue flowers to 50cm long are produced in late spring or early summer, and followed by dark grey seed pods

Position

Full sun

Soil Types

Chalk, Loam, Sand

Max Height

1-1.5 metres

Max Spread

0.5-1 metres

Size

Time to Maturity
2–5 years
Max Spread
0.5-1 metres
Max Height
1-1.5 metres

Growing Conditions

Chalk Loam Sand
Moisture
Well–drained
pH
Acid or Alkaline or Neutral

Position

Full sun
Aspect
South–facing or West–facing
Exposure
Exposed
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
Drought Resistance
Yes

Colour & Scent

Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family
Fabaceae
Native to GB/Ireland
No
Foliage
Deciduous
Habit
Clump forming
Genus
Baptisia are perennials with branched stems bearing three-parted leaves and terminal or axillary racemes of pea flowers, followed by conspicuous inflated pods
Name Status
Accepted

How to Grow

Cultivation

Thrives in deep, well-drained, preferably sandy soil in an open, sunny position. Plants can be slow to establish, and dislike being disturbed, but mature plants have good drought tolerance

Propagation

Propagate by softwood or semi-ripe cuttings. Hybrid cultivars will not come true from seed

Suggested planting locations and garden types

  • Cottage and informal garden
  • Prairie planting
  • Wildlife gardens
  • Cut flowers
  • Flower borders and beds

Pruning

No pruning required, though plants can be trimmed back after flowering to maintain a compact shape, unless seed pods are required

Pests

Generally pest-free

Diseases

Generally disease-free