Sempervivum

Sempervivum spp.,Common Hens and Chicks, Houseleek

Sempervivum are rugged succulents native to the mountain ranges of Europe. Their name, "Always Living" translated from Latin, reflects their extreme adaptability. Unlike the tropical Echeveria, Sempervivum are built for alpine conditions: they can survive under a blanket of snow, in the cracks of stone walls, or in very shallow, poor soil. They are monocarpic, meaning the mother rosette (the Hen) puts all its energy into a final, dramatic flower stalk before dying, leaving its "Chicks" to take over.

Care Guide

LIGHT

  • Requires full, outdoor sun. While they can survive indoors, they often lose their vibrant colors and become "leggy" without the intensity of natural outdoor sunlight.

WATER

  • Extremely drought-tolerant. They prefer to dry out completely.
  • Outdoor Care: In most climates, rainfall is sufficient. In summer heatwaves, a deep soak once a week is plenty.
  • Winter: If planted in the ground, they require zero water during the winter months while they are dormant.

SOIL

  • Thrives in poor, rocky, or sandy soil. They actually struggle in "rich" potting soils because the organic matter holds too much moisture.

GROWTH HABIT

  • Extreme Cold-Hardiness: Many are hardy down to Zone 3 (-40°F).
  • Self-Propagating: They spread via "runners" (stolons), quickly forming a dense carpet.

PROPAGATING

  • Offset Division: The easiest way to propagate. Simply snip the thin runner connecting the chick to the hen and press the chick into the soil.

PRUNING

  • After-Bloom Care: Once the "Hen" flowers and dies, pull the dried-up flower stalk and dead rosette out of the ground to make room for the surrounding chicks to fill in the gap.

REPOTTING

  • Rarely required if they have room to spread.
  • If the container becomes a "solid mass" of rosettes, break them apart and move some to a new pot to ensure airflow.

FERTILIZING

  • Avoid fertilizing. They are adapted to nutrient-poor environments; fertilizer can make them grow too fast and lose their compact form.

TOXICITY

  • Non-toxic to humans and pets.

Variability in Care

Cobweb Types
Examples: S. arachnoideum

  • Moisture Trap: The "cobweb" hairs are designed to trap morning dew in the mountains.
  • In humid climates, this can lead to rot; these varieties need the most grit in their soil (70-80% grit).

Heuffelii Types
Examples: Sempervivum heuffelii

  • No Runners: These do not throw out "chicks" on strings. Instead, the main rosette splits into two "heads."
  • To propagate these, you must physically cut the root crown in half with a sterile knife.

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