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Cotyledon orbiculata Silver Dollar

Cotyledon orbiculata Silver Dollar
Pig's Ear, Round-leafed Navel-wort

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A selection with particularly wide leaves and a pure white colour with silver highlights. This large South African succulent plant has wide succulent leaves and produces tall flower spikes in the summer, adorned with tubular orange flowers. Not very hardy (-4°C), but highly resistant to drought, the Cotyledon is well suited for dry rockeries by the sea. In colder areas, it can be successfully grown in a pot protected over winter or as an indoor plant.
Flower size
3 cm
Height at maturity
80 cm
Spread at maturity
50 cm
Exposure
Sun
Hardiness
Hardy down to -4°C
Soil moisture
Dry soil
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Best planting time April to May
Recommended planting time March to May
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Flowering time June to August
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Description

Cotyledon orbiculata 'Silver Dollar' is an amazing succulent plant that captivates with its large succulent, bright silver-white leaves. Their white colour can vary in intensity depending on the season, but they remain bright and decorative all year round. An adult plant will produce original inflorescences in summer, bearing clusters of tubular orange flowers. Not very hardy, this cotyledon is easily grown in a pot indoors or outdoors during the warm season, like a cactus. Stunning in a Mediterranean rock garden!

Cotyledon orbiculata 'Silver Dollar' belongs to the Crassulaceae family. It is a selection with particularly wide and light foliage, found in nature. The species, Cotyledon orbiculata, is native to South Africa. Its cup-shaped leaves have earned it the nickname Pig's Ear. In its natural environment, this plant thrives in a semi-desert region called Karoo, often on rocky outcrops and in dry meadows. Its cold resistance is around -4 °C at its peak, and may be slightly lower in very dry soil. Once well rooted, this succulent plant can go without watering, even in the driest regions.

Slow-growing Cotyledon 'Silver Dollar' reaches about 1 m in height when flowering, with a spread of 50 cm at maturity when grown in the ground. In a pot, its dimensions will remain more modest. The plant forms a clump of upright and branching stems, bearing tightly grouped leaves at their tips. The leaves are thick and fleshy, obovate in shape and slightly concave. They can measure up to 20 cm in diameter. The leaf is covered with a white bloom, a powdery substance that is more abundant when the plant is exposed to the sun, the soil is dry, and the weather is hot. Therefore, the colour of the leaves varies from very pale green to very light grey and white. Flowering occurs in summer. The inflorescence is a long upright stem ending in a cyme. This cyme consists of 10 to 30 pendulous flowers with 5 fused petals forming an orangish-yellow tube, 2-3 cm long, opening into 5 small flared lobes.

On the coast, plant Cotyledon orbiculata 'Silver Dollar' in a rock garden, above a stone wall, or on a well-drained slope, in full sun. It will perfectly complement aloes, agaves, Mangaves, and Hesperaloe parviflora in an exotic setting. Elsewhere, you can plant it in a nice, heavy pot, alone or with other succulent plants like houseleeks, for example.

 

Flowering

Flower colour orange
Flowering time June to August
Inflorescence Cyme
Flower size 3 cm

Foliage

Foliage persistence Evergreen
Foliage colour White

Plant habit

Height at maturity 80 cm
Spread at maturity 50 cm
Growth rate slow

Botanical data

Genus

Cotyledon

Species

orbiculata

Cultivar

Silver Dollar

Family

Crassulaceae

Other common names

Pig's Ear, Round-leafed Navel-wort

Origin

South Africa

Planting and care

Plant Cotyledon orbiculata 'Silver Dollar' in a pot in April or in the ground in May (in mildest winter regions). It can be planted in full sun or partial shade, very bright in a well-drained, light, sandy to rocky, poor soil. This succulent does not tolerate frost below -4°C. If the soil is very dry in winter, it is slightly hardier. On the other hand, once well rooted, no watering is necessary in the ground. Use a very large and heavy pot as the plant significantly increases in weight with age. Use a succulent potting mix that is both well-draining and not too poor: a mixture of leaf compost, pumice or gravel, and turf or coconut fibre. In a pot, regular but moderate watering is necessary throughout the growing season, especially during summer. Overwinter your potted plant indoors, in a cold greenhouse (frost-free), or in the conservatory.

Planting period

Best planting time April to May
Recommended planting time March to May

Intended location

Suitable for Rockery
Type of use Container, Slope, Greenhouse, Conservatory
Hardiness Hardy down to -4°C (USDA zone 9b) Show map
Ease of cultivation Beginner
Planting density 1 per m2
Exposure Sun
Soil pH Any
Soil type Chalky (poor, alkaline and well-drained), Stony (poor and well-drained)
Soil moisture Dry soil, Very well-drained, lightweight.

Care

Pruning No pruning necessary
Disease resistance Good
Overwinter Needs to be stored

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