Sempervivum globiferum ssp. hirtum Borealis

Sempervivum Hirtum forms tight, geometric rosettes in forest green, with leaves edged in fine hairs. It grows in a clustering, spreading habit, sending out offsets that detach and root easily, which is why it earns the nickname hens and chicks roller. The spiky green rosette shape provides strong architectural character, and a single plant quickly becomes a wide-spreading colony.

When it blooms, Sempervivum Hirtum produces star-shaped flowers on upright stems, though each rosette flowers only once in its lifetime before giving way to surrounding offsets, so the colony always looks full and vital. The plant requires a cool night temperature drop to trigger the flowering cycle.

Move it outside in summer and keep it on a balcony through autumn; it handles wind and rain without trouble. This drought-tolerant succulent tolerates the dry heated air of indoor spaces during winter and is pet-friendly, safe for cats and dogs. It works well in rock gardens, container groupings, and raised beds where the spreading habit can expand freely.

Water it deeply every ten to fourteen days, allowing soil to dry completely between waterings.

Sempervivum Hirtum does best in fast-draining gritty succulent mix blended with perlite or coarse sand at a one-to-one ratio.

It handles temperatures from around -30F up to 90F and is impressively frost-tolerant.

Sempervivum Hirtum is a moderate to fast spreader via offsets and needs only a light balanced fertilizer once in spring.

It is hardy in USDA Zones 3 through 8, tolerating frost well below 0F. It grows outdoors year-round across Minnesota, Wisconsin, Michigan, New York, Pennsylvania, Ohio, Indiana, Illinois, Iowa, Missouri, Kansas, Nebraska, South Dakota, North Dakota, Montana, Wyoming, Colorado, Utah, Idaho, Oregon, and Washington, as well as Vermont, New Hampshire, Maine, Massachusetts, Connecticut, Rhode Island, New Jersey, Delaware, Maryland, Virginia, West Virginia, Kentucky, Tennessee, North Carolina, Arkansas, and New Mexico. It comes back in the colder stretches of Alaska and the upper Midwest each spring without any special winter protection.

Q: Is Sempervivum globiferum ssp. hirtum ‘Borealis’ safe to grow around cats and dogs?
A: It is non-toxic and safe for both cats and dogs.

Q: What happens if I overwater this succulent?
A: Sempervivum globiferum ssp. hirtum ‘Borealis’ develops root rot in soggy soil; it is far more forgiving of underwatering than overwatering.

Q: How fast does Sempervivum Hirtum spread?
A: It spreads at a moderate to fast pace by producing rolling offsets around the mother rosette, filling a container or garden patch within one to two growing seasons.

Q: Can I propagate this succulent easily?
A: Sempervivum Hirtum is self-propagating; offsets detach easily and root quickly when pressed into gritty, well-draining soil without any special tools or hormones.

Q: How cold can Sempervivum Hirtum tolerate?
A: It survives down to around -30F and grows in USDA Zones 3 to 8, so it can stay outdoors through autumn and winter without protection in most temperate climates.

Q: Will this plant work on a balcony in a container?
A: Sempervivum Hirtum handles balcony conditions well and grows in containers placed in full or partial sun, as long as the pot drains freely so water never pools around the roots.