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Pontederia lanceolata

Pontederia lanceolata
Giant Pickerel Weed

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This Pontederia forms a tuft taller than Pontederia cordata. It develops a magnificent lanceolate and erect foliage of a brilliant green before displaying beautiful azure-blue flowers in summer. It appreciates heat and sun, especially in order to flower well. Non-invasive, it is a wonderful aquatic or semi-aquatic plant for pond edges.
Flower size
8 cm
Height at maturity
1 m
Spread at maturity
55 cm
Exposure
Sun
Hardiness
Hardy down to -29°C
Soil moisture
Damp soil
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Best planting time April to May
Recommended planting time March to June, September to October
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Flowering time June to September
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Description

Pontederia lanceolata is similar to Pontederia cordata. However, it develops a taller clump of lance-shaped leaves to produce a beautiful plant, stunning when planted alone. Its slender habit, its erect bright green leaves, its stems reaching up to 1 m (3 ft) or 1.2 m (4 ft) in height, and its flowering with azure-blue spikes in summer make it a majestic aquatic or semi-aquatic plant. Flowering if it benefits from warmth and sunlight, it is not invasive and is easy to grow.

Pontederia lanceolata belongs to the Pontederiaceae family. This species is native to the shallow shores of North America, from Nova Scotia to Florida. It is a deciduous perennial plant with an upright and spreading habit. It reaches up to 1.2 m (4 ft) in height with a spread of 50 to 60 cm (20 to 24 in), and it has a rapid growth rate. It blooms from June to autumn in dense spikes of 5 to 10 cm (2 to 4 in), resembling orchid flowers, composed of bell-shaped azure-blue to lavender flowers illuminated by yellow stamens. The flowering is attractive to bees and butterflies, and it is followed by ovoid, red, sticky fruits that are enjoyed by ducks. The shiny lance-shaped leaves, 12 cm (5 in) wide and 25 cm (10 in) long, remain a medium green throughout the season and may sometimes have brown spots. It has thick and creeping rhizomes. It has a good purifying value (purifying value of reeds divided by two)*.

Plant Pontederia lanceolata in rich soil, submerged from 0 to 30 cm (0 to 12 in), or in 35 x 35 cm (14 x 14 in) baskets, preferably in spring, by burying the rhizome 10 to 15 cm (4 to 6 in) deep in the mud or by immersing the baskets. The substrate should ideally be humus-rich and clayey or loamy-clayey. This plant does not have specific soil pH requirements and can tolerate slightly alkaline, neutral, or slightly acidic soil. It prefers full sun or partial shade. Removing faded flowers can promote the appearance of new floral spikes. Pontederia lanceolata is perfectly hardy and highly resistant to urban pollution. Pontederia lanceolata is ideal in a wild or garden pond, or for decorating a patio container. It can also be used for mass planting in flooded areas and bogs.

*Plants used for phytopurification, such as Pontederia lanceolata, are increasingly used in small private sewage treatment plants and also in the installation of natural swimming pools and eco-friendly pools. First and foremost, they provide oxygen to the bacteria on the roots. These bacteria convert organic matter into mineral matter and nutrients. Secondly, the plant absorbs nutrients and removes elements that need to be eliminated, such as nitrates, phosphates, and heavy metals. Pontederia lanceolata is particularly effective at absorbing phosphates.

The fruits of Pontederia lanceolata were formerly consumed fresh, roasted, or ground into powder.

 

Flowering

Flower colour blue
Flowering time June to September
Inflorescence Spike
Flower size 8 cm

Foliage

Foliage persistence Deciduous
Foliage colour medium green

Plant habit

Height at maturity 1 m
Spread at maturity 55 cm
Growth rate fast

Botanical data

Genus

Pontederia

Species

lanceolata

Family

Pontederiaceae

Other common names

Giant Pickerel Weed

Origin

North America

Product reference189110

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Planting and care

Plant Pontederia lanceolata in rich soil, submerged from 0 to 30 cm (0 to 12 in), or in 35 x 35 cm (14 x 14 in) baskets, preferably in spring, by burying the rootstock 10 to 15 cm (4 to 6 in) into the mud, or by immersing the baskets. The substrate should ideally be humus-rich and clayey or loamy clay. This plant has no specific requirements regarding the soil pH, which can be slightly alkaline, neutral, or slightly acidic. Install it in full sun or partial shade. Faded flowers can be removed to promote the emergence of new flower spikes. Pontederia lanceolata is perfectly hardy and highly resistant to urban pollution.

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Planting period

Best planting time April to May
Recommended planting time March to June, September to October

Intended location

Suitable for Pond edge
Hardiness Hardy down to -29°C (USDA zone 5) Show map
Ease of cultivation Beginner
Planting density 3 per m2
Exposure Sun
Soil pH Any
Soil type Clayey (heavy), Clayey-chalky (heavy and alkaline), Silty-loamy (rich and light)
Soil moisture Damp soil, flooded, muddy

Care

Pruning instructions You can remove the faded flowers to promote the emergence of new spikes.
Pruning Pruning recommended once a year
Pruning time July to August
Disease resistance Very good
Overwinter Can be left in the ground

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