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Amsonia tabernaemontana - Eastern bluestar

Amsonia tabernaemontana
Eastern bluestar

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More information

A long spring to summer flowering, made up of clusters of light blue star-shaped flowers, on a plant whose stems bear beautiful very bright green leaves, decorative even outside of flowering. Hardy and vigorous, very long-lasting, this amsonia brings lightness and rural charm to the garden. A little slow to establish, it is easy to grow in the sun or partial shade, in well-drained soil, rather moist, even slightly damp in summer.
Flower size
3 cm
Height at maturity
80 cm
Exposure
Sun, Partial shade
Annual / Perennial
Perennial
Germination time (days)
50 days
Sowing method
Sowing under cover
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Sowing period February to July
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Flowering time May to July
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Description

Amsonia tabernaemontana is a robust North American perennial plant that should be seen more often in gardens. Adorned with a long spring to summer flowering consisting of clusters of light blue star-shaped flowers, and beautiful foliage of a very vibrant green, amsonia has a presence equivalent to that of a small shrub. In addition to these ornamental qualities, it has good hardiness combined with the vigor of wild plants. This amsonia will bring a lot of lightness and rural charm to perennial or shrub borders, in full sun or partial shade. It takes a little while to establish, but it is easy to grow in well-drained, moist, or even wet soil in summer.

 

Amsonia tabernaemontana is a plant from the Apocynaceae family, it is a cousin of our periwinkles native to the northeast and center of the United States. It can be found growing in sandy soils, in the undergrowth, in wet environments. This herbaceous perennial plant develops numerous shoots that elongate from spring and form with time bushy, very flexible clumps, with a slightly spreading habit, reaching approximately 70-80 cm (28-32in) in height when flowering and over 40 cm (16in) in width. This plant takes time to establish, but it is very perennial, reliable, and lives for many years. Its long blue and coiled buds open into small light blue flowers with a darker central line, very bright, which appear as very open tubes, hairy on the reverse side. The throat of the flower is white, washed in white-green and surrounded by white hairs. They are grouped in pyramidal panicles and bloom abundantly between May and July, even until autumn, for several weeks. The leaves are lanceolate in shape, about 15 cm (6in) long, and alternately arranged on the stems. Their colour is a light green marked by yellowish veins. They are very attractive even outside of the flowering period. The deciduous foliage takes on a beautiful autumn colour, bright yellow, before disappearing. The above-ground part of the plant disappears with the first frost, to spend the winter in dormancy.

 

Very hardy, Amsonia grow easily in full sun or partial shade, in well-drained soil that does not dry out in summer. A magnificent ornamental plant for gardens, Amsonia tabernaemontana enhances all its neighbours, whether opulent perennials or modest shrubs. You can easily associate it with daylilies, willowherbs, ironweeds, Cape lilies, perennial geraniums, or ornamental grasses in moist soil. It is also an excellent plant for partial shade, to be combined with bleeding hearts, Japanese anemones, which take over in August-September. Planted en masse, in a composition of Baptisia, large echinaceas, and sunflowers, amsonia provides an evocative and wild scene from another continent. Its flowers are also very beautiful in summer bouquets.

Amsonia tabernaemontana - Eastern bluestar in pictures

Amsonia tabernaemontana - Eastern bluestar (Plant habit) Plant habit

Flowering

Flower colour blue
Flowering time May to July
Inflorescence Panicle
Flower size 3 cm
Good for cut flowers Cut flower blooms

Foliage

Foliage persistence Deciduous
Foliage colour green

Plant habit

Height at maturity 80 cm
Spread at maturity 45 cm
Growth rate slow

Botanical data

Genus

Amsonia

Species

tabernaemontana

Family

Apocynaceae

Other common names

Eastern bluestar

Origin

North America

Product reference862141

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Planting and care

Sowing tip: sow from February to July

Sow the seeds on the surface of a good light compost, enriched with sand and peat, moist but well-drained. Cover with a thin layer of vermiculite or compost. Seal tightly in a transparent plastic bag and maintain at a temperature of 13 to 15°C for 2 to 3 weeks. For summer sowings, you can store your tray in the refrigerator at 3°C for 3 to 6 weeks, then transfer it to a place maintained at 13-15°C until germination, which can be very long (30 days to one year). Expose the sowing to light, as this facilitates germination.

Transplant the seedlings, when they are large enough to handle, into 7.5 cm (3in) diameter pots. Grow them in a cool place for 10 to 15 days, before planting them outside in spring or autumn, spacing them 30 cm (12in) apart..

Cultivation tip:

Easy to grow in a fresh, light or sandy, loamy or chalky soil, but preferably well-drained, as this plant, which appreciates water in summer, deteriorates in overly wet soil in winter. It thrives in partial shade or non-burning sun. It requires very little maintenance, just a little cleaning in late winter.

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Sowing period

Sowing period February to July
Sowing method Sowing under cover
Germination time (days) 50 days

Intended location

Suitable for Meadow, Woodland edge
Type of use Border
Hardiness Hardy down to -15°C (USDA zone 7b) Show map
Ease of cultivation Experienced
Exposure Sun, Partial shade
Soil pH Any
Soil moisture Moist soil, Damp soil, Ordinary but well-draining.

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