Spiderwort

How to care for Spiderwort

Light

Tradescantia zebrina performs best in bright, indirect light, which keeps its characteristic silver and purple colouration vivid. Direct midday sun can scorch the leaves, leaving pale or brown patches, but a couple of hours of gentle morning sun is generally tolerated. In low-light conditions the plant will survive but the metallic stripes become less pronounced and growth slows considerably, so a position near a bright window is strongly recommended.

Watering

Water moderately during the growing season, allowing the top 2-3 cm of compost to dry out before watering again. The plant is moderately drought-tolerant thanks to its succulent-like stems, but prolonged dryness causes leaf tips to brown and stems to become limp. In winter, reduce watering frequency significantly as growth slows and the risk of root rot increases if the compost remains wet for extended periods.

Soil and potting

A free-draining, peat-free general-purpose compost suits this species well. Adding 20-30% perlite or horticultural grit improves drainage and reduces the risk of waterlogging, which is the most common cause of root rot. Tradescantia zebrina is not fussy about soil pH, performing adequately across a slightly acidic to neutral range of around 5.5-7.0.

Feeding

Apply a balanced, water-soluble liquid fertiliser diluted to half strength every two to four weeks from early spring through to the end of summer. Feeding is not necessary in autumn and winter when the plant is not actively growing. Over-fertilising can cause excess leggy growth with reduced colour intensity, so restraint is advisable.

Humidity and temperature

This plant appreciates moderate to high humidity, ideally 50% or above, which helps prevent the leaf tips from turning brown and crispy. It tolerates typical household humidity but benefits from occasional misting, a pebble tray with water, or grouping with other plants. Keep the plant at temperatures between 15 C and 27 C; it dislikes cold draughts and should not be exposed to temperatures below 10 C for prolonged periods.

Repotting

Repot in spring every one to two years, or when roots begin to emerge from the drainage holes. Move up one pot size at a time, using fresh free-draining compost. Because the plant grows quickly and becomes straggly, many growers find it more practical to take cuttings and start fresh rather than continually repotting an ageing specimen.

Pruning

Regular pinching out of stem tips encourages a bushy, compact habit and prevents the plant from becoming bare and leggy at the base, which happens naturally as older leaves drop. Remove any dead, yellowing, or damaged leaves promptly. Cut stems back by up to one-third in spring to rejuvenate older plants; the cuttings can be used for propagation.

Is Spiderwort toxic?

Common problems

How to propagate

Stem cuttings in water

Cut a healthy stem of 7-12 cm just below a node, remove the lower leaves, and place in a glass of clean water in a bright position. Roots typically develop within one to three weeks, after which the cutting can be potted into compost.

Stem cuttings in compost

Prepare cuttings as above and insert several into moist, free-draining compost. Place in a warm, bright position and keep the compost consistently moist. Cuttings generally root within two to four weeks and can be treated as mature plants thereafter.

Division

When repotting an established plant, the root mass can be separated into two or more sections by hand or with a clean, sharp knife. Each division should have healthy roots and several stems, and can be potted individually into fresh compost.

Where Spiderwort comes from

Native to southern Mexico, Guatemala, Belize, Honduras, Nicaragua, Costa Rica, Colombia, Venezuela.

Story and origins

The genus name Tradescantia honours John Tradescant the Elder (c. 1570-1638) and his son John Tradescant the Younger (1608-1662), English botanists, plant hunters, and gardeners to King Charles I. They introduced numerous plant species to British horticulture from expeditions to Europe, Russia, and North America. The species epithet 'zebrina' is derived from the Latin 'zebrina', meaning zebra-like, and refers to the distinctive alternating stripes of silver and green on the leaf surface, which resemble the banding of a zebra.

Tradescantia zebrina is native to Mexico and Guatemala, where it grows naturally as a ground-covering plant in shaded, moist habitats. It was formally described by the German botanist Heinrich Moritz Willkomm in 1862 under the name Zebrina pendula, and was a popular Victorian conservatory and greenhouse plant in Britain during the latter half of the nineteenth century. Its ease of cultivation and striking foliage made it one of the most widely distributed houseplants of the twentieth century. In some tropical and subtropical regions outside its native range, including parts of Australia and various Pacific island groups, the plant has become naturalised and is considered an environmental weed, capable of forming dense ground cover that suppresses native vegetation.

Varieties to know

Tradescantia zebrina 'Purpusii'

Features more strongly bronze-green upper leaves with less prominent silvery striping and a deep burgundy-purple underside; slightly less vigorous than the species.

Tradescantia zebrina 'Quadricolor'

A striking cultivar displaying four colours, with striped leaves in green, silver, pink, and red-purple; the most ornate and widely sought form.

Tradescantia zebrina 'Red Hill'

Known for particularly vivid red-purple tones across the foliage with reduced silver striping; colour intensifies in bright light.

Fun facts

• Despite its common name 'Inch Plant', the reference is to how quickly it roots and spreads, reportedly advancing an inch at a time, rather than to the size of its leaves.
• Tradescantia zebrina produces small, three-petalled flowers that are typically pink to magenta in colour; although modest in size, they can appear year-round on plants grown indoors in adequate light.
• The plant has been used in traditional medicine in parts of Mexico and Central America, particularly as a topical treatment for skin conditions, though these uses are not substantiated by clinical evidence.
• NASA did not include Tradescantia in its Clean Air Study, but related Commelinaceae species have been studied for phytoremediation; the genus is frequently cited in air quality studies, though results for indoor conditions are modest.
• Tradescantia zebrina was formerly classified as Zebrina pendula before molecular studies led to its reclassification into the broader Tradescantia genus in the late twentieth century.

Spiderwort FAQ