Sempervivum arachnoideum cobweb is a low-growing succulent reaching a height of about 3” inches. Each rosette measures about 1” – 1.5” inch in diameter whereas the entire plant spreads approximately 8” – 12” inches wide.
The mother rosette, known as the Hen, spreads in a circular pattern by growing horizontal stems in every direction. These stems produce new rosettes called offsets or chicks. Each new rosette becomes independent of the mother rosette by developing its own root system before detaching itself from the connecting stolon.
Source: Plant Care Today