Hens and Chicks

How to care for Hens and Chicks

Light

Sempervivum tectorum thrives in the brightest position available indoors, ideally a south- or west-facing windowsill that receives several hours of direct sun each day. Insufficient light causes the rosettes to etiolate, stretching upward and losing their compact, symmetrical form. Outdoors or on a sunny balcony, the plant will colour up more intensely, with leaf tips deepening to reddish-purple in response to high light and temperature stress.

Watering

This species stores water in its leaves and is extremely drought-tolerant. Water thoroughly and then allow the compost to dry out completely before watering again, which in summer may mean every two to three weeks and in winter as infrequently as once a month or less. Overwatering is by far the most common cause of failure; water sitting around the base of the rosette promotes rot, so always water at the base of the pot rather than over the plant.

Soil and potting

A gritty, extremely free-draining mix is essential. A proprietary cactus and succulent compost improved with up to 50 per cent horticultural grit or perlite is suitable. Heavy, moisture-retentive potting compost will cause root rot. Shallow terracotta pots or alpine pans are preferred as they allow rapid drying and good airflow around the roots.

Feeding

Sempervivum tectorum requires very little feeding and in poor or average soils it performs best. If the plant has been in the same compost for a full growing season, a single application of a balanced liquid fertiliser diluted to half the recommended strength in early spring is sufficient. Avoid high-nitrogen feeds, which produce lush, weak growth that is more susceptible to rot and pest attack.

Humidity and temperature

As a mountain plant, Sempervivum tectorum prefers cool to moderate temperatures and tolerates low humidity with ease. Indoors it copes well with the dry air typical of centrally heated homes. It does not appreciate hot, stuffy conditions and benefits from ventilation in summer. When kept outdoors, it is frost-hardy to approximately minus 15 C or below, though indoor container specimens should be protected from sustained frost if the pot is small and roots are exposed.

Repotting

Repot every two to three years or when the pot becomes crowded with offsets. Choose a pot only slightly larger than the root system, as excess compost stays wet too long. Spring is the best time to repot. Refresh the gritty compost at this point and tease away any dead or rotting root material before resettling the plant.

Pruning

Pruning is minimal. Remove dead or shrivelled outer leaves by gently pulling them away from the base to improve airflow and prevent fungal problems. After a rosette has flowered it dies (the plant is monocarpic at the individual rosette level); remove the spent flowering rosette once it is fully dead and dried to make space for the surrounding offsets. Detach unwanted chicks with a clean knife or by gentle twisting.

Is Hens and Chicks toxic?

Common problems

How to propagate

Offsets (chicks)

Gently detach well-developed offsets from the mother rosette, ideally those that have already developed their own small roots. Allow the cut surface to callous for a day before placing on the surface of gritty compost; roots will establish within a few weeks.

Seed

Sow seeds on the surface of a gritty, moist compost in spring and cover with a thin layer of fine grit. Germination occurs at around 18 to 22 C over two to four weeks. Growth is slow initially; seedlings are typically small in their first season.

Where Hens and Chicks comes from

Native to Alps, Pyrenees, Carpathians, Apennines, Balkans, Caucasus, Atlas Mountains of Morocco.

Story and origins

The genus name Sempervivum derives from the Latin 'semper' (always) and 'vivum' (alive or living), a reference to the plant's extraordinary ability to survive harsh conditions including drought and frost. The species epithet tectorum comes from the Latin 'tectum' (roof), reflecting the long-standing practice of growing the plant on thatched or tiled rooftops across Europe. The English common name houseleek combines 'house' (again referencing the roof-dwelling habit) and 'leek', an old term for a plant, related to the Old English 'leac', historically applied to various fleshy-leaved plants.

Sempervivum tectorum has been cultivated in Europe for at least two thousand years. In Roman and later medieval tradition it was planted on rooftops and walls as a protective charm, particularly against lightning and fire. The Emperor Charlemagne's capitulary De Villis, issued around 812 AD, listed the houseleek among plants to be cultivated on imperial estates, cementing its status as a useful and symbolic plant. In Norse mythology it was associated with Thor, giving rise to common names such as Thor's Beard, and it was thought that his protection resided in the plant. Throughout the Middle Ages it featured in European herbals as a remedy for skin complaints, fevers and inflammation. It was introduced to British gardens many centuries ago and has long since naturalised on old walls, ruins and rocky ground across the British Isles.

Varieties to know

Sempervivum tectorum 'Atropurpureum'

Deep red-purple rosettes; one of the most richly coloured cultivars, intensifying in full sun.

Sempervivum tectorum 'Royanum'

Mid-sized rosettes with green leaves tipped distinctly red-brown; a classic garden cultivar.

Sempervivum tectorum 'Sunset'

Leaves display a warm blend of orange, pink and red tones particularly prominent in cooler months.

Sempervivum tectorum 'Nigrum'

Very dark, near-black rosette tips contrasting with a green base; compact and dramatic.

Sempervivum tectorum 'Grandiflorum'

Larger than average rosettes with broad, fleshy leaves; vigorous and free-offsetting.

Fun facts

• The Romans planted Sempervivum tectorum on rooftops in the belief that it protected buildings from lightning strikes, a tradition encouraged by the Emperor Charlemagne who reportedly decreed that every household should grow it on its roof.
• Each individual rosette of Sempervivum tectorum is monocarpic, meaning it flowers exactly once then dies; however, the plant propagates so prolifically via offsets that the colony continues indefinitely.
• The genus name Sempervivum translates directly as 'always alive' in Latin, reflecting the plant's remarkable capacity to survive drought, frost and neglect that would kill most other plants.
• Sempervivum tectorum has been found growing wild at altitudes above 3,000 metres in the Alps, where it endures extreme temperature fluctuations, intense UV radiation and thin, nutrient-poor soils.
• The fresh leaf gel has been used in European folk medicine for centuries as a topical remedy for minor burns, insect stings and warts, in a similar manner to Aloe vera.

Hens and Chicks FAQ