plant image thumbnail
plant image thumbnail
plant image thumbnail
plant image thumbnail
Cobweb Houseleek

English Name

Sempervivum Arachnoideum

Scientific Name

Description

From the Latin semper - always and vivum - living. The small green rosettes, often flushed with maroon, are covered in a spider's web of silky white hairs. From this appear stiff flower stems terminated by big flattish clusters of starry usually pink or purplish flowers.

Europe

Origin

41°F - 70°F

Temperature (°F)

Maximum: 5"

Height (feet/inches)

Hardy Perennial

Life Cycle

Summer

Season

None

Fragrance

Color

Watering

During the Summer, give the plant a good soak whenever it feels dry. Through the Winter keep the compost much drier at all times. Water only when the leaves show signs of shrivelling. It will not tolerate overwatering.

Feeding

Feed monthly in Summer.

Repotting

Re-pot when the pot has become overcrowded with rosettes in Spring.

Propagation

Plant non flowering rosettes individually in a cold frame in Autumn and Spring.

Cultivation

Sempervivums need a spot in full light and will tolerate a wide range of temperatures. Too much water will lead to rot while too much heat and food will cause limp and inappropriate growth.

Tips

The rosette which carried the blooms will die off as the blooms fade, but others will grow up to replace it.

Care

During very hot weather, move plant out of the sun's direct rays. Few pests and diseases trouble this plant.

Decorate

Sempervivum is an admirable plant for ledges in the rock garden, for walls or other hot and dry positions where there is little soil.

Humidity

This plant needs no additional humidity.

Soil

Well drained soil.



Did you know?

Most plant cells look like little boxes full of green disks. The disks are called chloroplasts. Other organelles inside a plant cell include a nucleus (where the DNA is kept), a large central vacuole (where water and other materials are stored) and a complex internal skeleton or cytoskeleton made of various proteins.