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Myosotidium hortensia

Myosotidium hortensia
Chatham Island Forget-me-not

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More information

An amazing, opulent perennial which develops shiny hosta leaves and produces large clusters of forget-me-not flowers resembling hydrangea heads in March-April. Rare and superb myosotidum is quite delicate to cultivate as it hates severe frost, likes partial shade, and requires humus-rich, well-drained, non-chalky soil that remains moist in summer.
Flower size
2 cm
Height at maturity
40 cm
Spread at maturity
40 cm
Exposure
Sun, Partial shade
Hardiness
Hardy down to -6°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 March to May
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Description

Myosotidum hortensia, the Chatham Island forget-me-not, is a perennial which is rare in cultivation and is also becoming scarce in its native habitat. This plant has a unique and somewhat strange appearance with glossy hosta-like foliage and large clusters of forget-me-not flowers. It likes a humid, mild winter and temperate summer climate in well-drained, acidic, rich, and slightly moist soil and tolerates salt spray. In colder regions it can be grown in a large pot, sheltered in a cold greenhouse during winter.

Myosotidum hortensia (synonym Cynoglossum nobile) is in the borage family, just like forget-me-nots. It is an endemic New Zealand species found on the Chatham Islands. In the wild, it grows on coastal cliffs, rocky outcrops, and beaches. Its root forms a large creeping rhizome just below the surface of the soil. The vegetation forms a rosette measuring about 40 cm (16in) in all directions (1 m (3ft) in New Zealand). The ovate leaves are very wide, thick, leathery, beautiful bright green, shiny, and heavily puckered, halfway between hosta and Bergenia leaves. Between March and May, beautiful sky blue flowers turning violet appear, like forget-me-nots but larger. Each flower measures about 1.5 cm (1in) in diameter, tightly packed on strong stems. After pollination, black, flattened seeds about 1 cm (0in) big are formed. The foliage is evergreen the plant is hardy to around -10 °C (14°F) when mature, in a sheltered position.

Myosotidum can be grown in the ground under suitable climate and soil conditions or in a shallow pot to give more control of the growing medium and watering,  overwintering in a bright, frost-free location. This plant does not tolerate heat, drought (both in soil and air), or limestone.

Myosotidium hortensia in pictures

Myosotidium hortensia (Flowering) Flowering

Flowering

Flower colour blue
Flowering time March to May
Flower size 2 cm

Foliage

Foliage persistence Evergreen
Foliage colour green

Plant habit

Height at maturity 40 cm
Spread at maturity 40 cm
Growth rate very slow

Botanical data

Genus

Myosotidium

Species

hortensia

Family

Boraginaceae

Other common names

Chatham Island Forget-me-not

Origin

Oceania

Product reference83861

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Planting and care

These are beautiful perennial plants with conflicting advice regarding their cultivation. After several unsuccessful attempts, we have been growing them in our garden for 10 years and now know their needs well. They require a semi-shaded location, in soil that is rich, moist, and very well-drained. Excess moisture in winter is fatal. Rocky soil suits them, so they can be planted in a shady rockery, on humus-rich soil without limestone. They do not tolerate temperatures below -10°C (14°F) well, but you can easily dig up the crowns, put them in pots and bring them indoors in a bright, unheated but frost-free room during winter and stop watering for 2, or even 3 months, then put back outside in March.

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Planting period

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

Intended location

Suitable for Shaded rockery, Woodland edge
Type of use Border, Container, Conservatory
Hardiness Hardy down to -6°C (USDA zone 9a) Show map
Ease of cultivation Experienced
Planting density 5 per m2
Exposure Sun, Partial shade
Soil pH Acidic, Neutral
Soil type Silty-loamy (rich and light)
Soil moisture Moist soil, rich and well-draining

Care

Pruning No pruning necessary
Disease resistance Average
Overwinter Can be left in the ground

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