Pontederia cordata var. lancifolia

Synonyms

Pontederia lanceolata
Pontederia lancifolia

Aquatic Bogs

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A marginal aquatic perennial, to 1.2m tall, forming a clump of lance-shaped leaves borne on long, upright stalks. In late summer it produces tubular blue flowers in densely packed spikes on tall flower stems. A good plant to provide a strong, vertical accent at a pond margin

Position

Full sun

Soil Types

Loam

Max Height

1-1.5 metres

Max Spread

0.1-0.5 metres

Size

Time to Maturity: 2–5 years
Max Spread: 0.1-0.5 metres
Max Height: 1-1.5 metres

Growing Conditions

Loam

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

Position

Full sun

Aspect: 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): H5

Colour & Scent

Season	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family: Pontederiaceae
Native to GB/Ireland: No
Foliage: Deciduous
Habit: Columnar upright, Clump forming
Genus: Pontederia are herbaceous perennials from marginal aquatic habitats, forming clumps of erect, linear or lance-shaped leaves, with 2-lipped blue flowers in dense terminal spikes in late summer and early autumn
Name Status: Correct
Plant Range: E. and S. USA, Mexico

How to Grow

Cultivation

Grow in aquatic planting baskets of fertile, loamy soil at the margins of a pool or in a large, water-filled tub on a sheltered patio; submerge in no more than 20cm of water. Site in full sun. See pond plants and bog gardens for further advice

Propagation

Propagate by seed, sown in containers outdoors as soon as ripe. Divide in late spring

Suggested planting locations and garden types

Architectural
Patio and container plants

Pruning

Cut back leaf stems to just above the water level in early winter

Pests

Generally pest-free

Diseases

Generally disease-free