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String of Hearts

Ceropegia linearis subsp. woodii

SA tree number

English: String of Hearts, Necklace Vine, Rosary Vine, Wood’s Ceropegia, Hanging Milkwort, Jacob’s Beard, Little Pitchers, Chain of Hearts, Collar of Hearts, Hearts Entangled, Hearts-on-a-string, Sweetheart Vine, Heart Vine, Old Man's Pipes

Afrikaans: Hartjieswingerd, Halssnoer-ranker

Zulu: isiDakwa, uVemvane Samatshe, uVemvane Lwamatshe

Historical scientific names: Ceropegia woodii, Ceropegia linearis var. woodii, Ceropegia linearis f. woodii, Macropetalum woodii

Ceropegia linearis subsp. woodii, commonly known as String of Hearts or Hartjieswingerd, is a beautiful indigenous succulent perennial climber or trailing plant. It is widely cultivated for its distinctive, heart-shaped, fleshy leaves, which are often marbled with silver and purple on the underside, and its unusual, intricate, tube-like flowers, making it a popular choice for hanging baskets and indoor decoration.

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Distinguishing features:

Distinctive, fleshy, heart-shaped leaves, often variegated with silver-grey on the upper surface and purple on the underside.
Stems are thin and wiry, producing small, round tubers (like beads) at the nodes.
Unusual, small, lantern-shaped or urn-shaped flowers, typically pinkish-purple or brownish, with fused petal tips forming a cage-like structure.
Forms a long, trailing "chain" of leaves and stems.

Overall appearance:

The Chain of Hearts (Ceropegia linearis subsp. woodii) is a delicate yet hardy succulent plant that creates a graceful display of trailing stems adorned with numerous heart-shaped leaves. Its distinctive foliage, often featuring beautiful silver patterns on dark green with purple undersides, and its intriguing, small, lantern-like flowers make it a captivating and popular ornamental plant, especially when allowed to cascade from hanging baskets.

Height:

As a trailing plant, its stems can hang downwards for 1 to 2 metres or more. When climbing, it can extend several metres if given support.

Width:

Can spread to a width of 20 to 50 centimetres or more, forming a dense cluster of hanging stems.

Leaves:

The leaves are opposite, succulent, fleshy, and distinctly heart-shaped (cordate), typically 1-2.5 cm long and 1-2 cm wide. The upper surface is dark green, often beautifully marbled with silver-grey patterns along the veins. The underside is usually purplish-red. They are borne on slender, wiry stems, and small, round tubers (often called "beads" or "bulbils") frequently form in the leaf axils along the stems.

Flowers:

The flowers are small, highly unusual, and intricately structured, resembling miniature lanterns or urns. They are typically 2-3 cm long and appear singly in the leaf axils. The colour varies from pale pinkish-purple to brownish-pink or purplish-brown, often mottled. The five petals are fused at the base to form a swollen tube, and their tips meet and fuse at the apex, creating a cage-like or lattice-like structure that traps small insects for pollination. Small hairs often line the inside of the tube, facing downwards. Ceropegia linearis subsp. woodii flowers are hermaphroditic, containing both male and female reproductive parts.

Flowering season:

It can flower sporadically throughout the year, but most prolifically from late summer through autumn and into winter (around February to June).

Fruits:

The fruit is a paired, horn-like follicle, typically 5-8 cm long, resembling two slender pods joined at the base. They ripen to a light brown and split open longitudinally when mature.

Seeds:

The seeds are small, flattened, and oval-shaped, each with a tuft of long, silky white hairs (a coma) at one end. These hairs allow the seeds to be dispersed by wind.

Stems:

The stems are very slender, wiry, purplish-brown, and can reach several metres in length. They trail downwards or climb if given support. Small, bead-like, greyish-green tubers (bulbils) often form along the stems at the nodes; these can be used for propagation.

Thorns:

None.

Roots:

It has a fibrous root system that develops from its base and also from the small tubers (bulbils) that form along the stems where they touch the soil, allowing it to root readily.

Soil type:

Requires very well-drained, gritty, or succulent potting mix. It is intolerant of heavy, waterlogged soils. A mix designed for cacti and succulents is ideal.

Aspect:

Prefers bright, indirect light. Direct scorching sun can burn the leaves, especially in hot climates, but too little light will lead to sparse growth and less vibrant leaf colouration. It tolerates dry air but thrives in moderate humidity. It is very sensitive to frost and should be protected from cold temperatures, ideally grown indoors in cooler climates.

Ediblity:

Not typically considered edible for humans.

Toxicity:

Considered non-toxic to humans and pets, making it a safe choice for indoor plants.

Uses:

Primarily cultivated as an ornamental plant, especially popular for hanging baskets, where its long, cascading chains of heart-shaped leaves can be fully appreciated. It is also grown in pots on shelves or windowsills. Its low maintenance and attractive foliage make it a favourite indoor plant.

Ecology:

The unusual, trap-like flowers are adapted for pollination by small flies (often gnats or midges). These insects are attracted by the faint scent (which can be slightly musty or fungal for some people) and are temporarily trapped within the flower, facilitating pollen transfer. The seed dispersal is wind-assisted due to the silky hairs on the seeds. In its natural habitat, it scrambles over rocks and into crevices, providing minor ground cover and shelter.

Distribution and habitat:

Ceropegia linearis subsp. woodii is indigenous to South Africa, specifically found in KwaZulu-Natal, Mpumalanga, and Eswatini (Swaziland), and extends into Zimbabwe. It typically grows in rocky, well-drained areas, often scrambling over rocks or trailing from crevices and cliffs, usually in partial shade under trees or shrubs.

Derivation of name:

The genus name Ceropegia comes from the Greek words 'keros' (wax) and 'pege' (fountain), referring to the waxy texture and fountain-like appearance of some species' flowers.
The species epithet linearis means 'linear' or 'narrow', referring to the linear leaves of the typical Ceropegia linearis species.
The subspecific name woodii honours John Medley Wood, a notable botanist and curator of the Natal Herbarium, who first collected this plant in the late 19th century in KwaZulu-Natal.
Common names like "Chain of Hearts" and "String of Hearts" directly describe its growth habit and the shape of its leaves.
"Rosary Vine" refers to the bead-like tubers (bulbils) that form along the stems, resembling rosary beads.

Historical aspects:

Ceropegia linearis subsp. woodii was first discovered in 1881 by John Medley Wood in KwaZulu-Natal. It quickly gained popularity as a houseplant in Victorian times due to its unique appearance and ease of care. It has remained a beloved ornamental plant worldwide for over a century, a testament to its beauty and resilience. Its unusual floral structure also makes it a fascinating subject for botanists studying pollination mechanisms.

Interesting facts:

This plant is like a living string of little green and silver hearts – perfect for showing someone you care!
Those strange, tube-like flowers look like tiny, intricate lanterns or even alien spaceships!
It grows little "beads" (actually mini tubers) along its stems, which look just like tiny rosary beads, giving it one of its cool nicknames.
If you break a stem, don't worry! You can often just pop one of those little "beads" into some soil, and it will start a brand new plant.

Growing tips:

Propagation: Very easy to propagate! You can plant the small "beads" (bulbils) that form on the stems, or take stem cuttings and lay them on top of moist soil. Rooting often occurs from the nodes.
Light: Prefers bright, indirect light. A north or east-facing window is ideal. Avoid harsh direct sun, especially in hot climates, as it can scorch the leaves.
Watering: As a succulent, it prefers infrequent but thorough watering. Allow the soil to dry out completely between waterings. Reduce watering significantly in winter. Overwatering is the most common cause of problems.
Soil: Use a well-draining succulent or cactus potting mix. Adding perlite or coarse sand can improve drainage further.
Container: Excellent for hanging baskets where its trailing stems can cascade beautifully.
Temperature: Keep warm; it is sensitive to frost. Ideal temperatures are between 18°C and 27°C. Bring indoors if temperatures drop below 10°C.

This plant is a fantastic alternative for:

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