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Isotoma axillaris Beths Blue - Rock Isotome

Isotoma axillaris Beth's Blue
Rock Isotome, Showy Isotoma, Australian Swamp Star

4,2/5
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1 reviews

None have survived more than 2 weeks after transplantation...

Ric , 19/11/2023

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This plant carries a 6 months recovery warranty

More information

Perennial in Australia and grown as an annual in our climate, this plant forms a round and dense clump of finely cut foliage, with well-branched stems covered in countless small star-shaped flowers of a bright lavender mauve, fragrant, from summer to autumn. This Laurentia is a plant of texture and contrast, to be combined with other annuals in hanging baskets, planters and borders.
Flower size
2 cm
Height at maturity
25 cm
Spread at maturity
25 cm
Exposure
Sun
Hardiness
Hardy down to -4°C
Soil moisture
Moist soil
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Best planting time March to April
Recommended planting time March to June
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Flowering time June to October
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Description

Laurentia 'Beth's Blue', a variety of Isotoma axillaris, is a very recent American creation, with its lavender-purple flowering with blue reflections being particularly bright. This infinitely graceful perennial plant, often grown as an annual in our climates, forms a beautiful dome of finely cut foliage, covered with countless small pleasantly scented star-shaped flowers from summer to autumn. This variety is vigorous and heat resistant. It brings an extremely fine and delicate texture to all your compositions, whether in border plantings or in hanging baskets and containers on the terrace.

 

Originally from Australia, Solenopsis axillaris is a herbaceous perennial with woody base that grows very rapidly and is often cultivated as an annual due to its lack of hardiness, but also because of its long and abundant flowering. It belongs to the Campanulaceae family. It quickly forms a branched clump, naturally compact and nicely rounded, measuring 25 to 30cm (10 to 12in) in all directions. Its narrow, tapered, finely cut and toothed evergreen leaves are dark green. From May to October, and even until the first frosts, it produces countless small flowers with 5 pointed lobes arranged in a star shape. They are pleasantly scented. This plant is resistant to heat and drought, but will be more floriferous in fertile and moist soil.

 

Isotoma 'Beth's Blue' is an easy to grow and very floriferous plant, although it is little known to amateur gardeners. Decorative with its beautiful mauve-blue flowering, it can be used in flower beds among other plants, en masse in borders, and of course in pots, hanging baskets, and containers. It harmonizes well with a wide variety of other annual or perennial plants such as begonias, petunias, Bacopas, Nemesias, pink Gypsophila, or with pelargoniums, which it lightens the silhouette, for example. It is a lovely rock garden plant, which can be combined with Osteospermum, poppies, dahlias, or even with roses in orange, pink, or white tones.

 

Note: Please note that our young plug plants are professional products reserved for experienced gardeners: upon receipt, transplant and store them under cover (veranda, greenhouse, cold frame...) at a temperature above 14°C (57.2°F) for a few weeks before planting them outdoors once the risk of frost is definitively gone.

 

Isotoma axillaris Beths Blue - Rock Isotome in pictures

Isotoma axillaris Beths Blue - Rock Isotome (Flowering) Flowering
Isotoma axillaris Beths Blue - Rock Isotome (Foliage) Foliage
Isotoma axillaris Beths Blue - Rock Isotome (Plant habit) Plant habit

Flowering

Flower colour mauve
Flowering time June to October
Inflorescence Solitary
Flower size 2 cm
Fragrance slightly scented
Good for cut flowers Cut flower blooms

Foliage

Foliage persistence Semi-evergreen
Foliage colour dark green

Plant habit

Height at maturity 25 cm
Spread at maturity 25 cm
Growth rate fast

Botanical data

Genus

Isotoma

Species

axillaris

Cultivar

Beth's Blue

Family

Campanulaceae

Other common names

Rock Isotome, Showy Isotoma, Australian Swamp Star

Origin

Cultivar or hybrid

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Planting and care

Laurentia requires very little maintenance and is content with a sunny exposure. Install it in the garden after the last frosts. Make sure the plant does not lack water and remove faded flowers from time to time. Water-efficient, it will be more floriferous and beautiful when planted in soil that remains slightly moist. In very mild climates, it shows itself to be perennial, but it is advisable to overwinter the plant if you want to keep it from one year to the next. Repot it and keep it in a veranda or cold greenhouse in winter. Attention: the sap of this plant can be irritating to certain individuals. Slugs and snails enjoy its foliage: be sure to protect your young plants in spring.

Planting period

Best planting time March to April
Recommended planting time March to June

Intended location

Suitable for Meadow, Rockery
Type of use Edge of border, Container, Slope
Hardiness Hardy down to -4°C (USDA zone 9b) Show map
Ease of cultivation Amateur
Planting density 5 per m2
Exposure Sun
Soil pH Any
Soil type Silty-loamy (rich and light)
Soil moisture Moist soil, Free-draining, light, rich.

Care

Pruning instructions To extend the flowering period, you can regularly remove the faded flowers.
Pruning Pruning recommended once a year
Pruning time July to September
Disease resistance Good
Overwinter Needs to be stored
4,2/5
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