Sempervivums are most valued for their distinctive rosettes of succulent, spirally patterned foliage, although they also bear attractive flowers from spring to summer. Each rosette is a separate plant, and is monocarpic – it flowers once and then dies, but is soon replaced by other new rosettes, called offsets.
Also question is, why is my hen and chick growing up?
If you notice your hens and chicks growing tall, it is because it lacks light. When a plant does not receive enough sunlight, it begins to stretch and loses its beautiful original shape, especially those that have a rosette shape: sempervivums, echeverias, graptoverias and the like.