Sedums are the plants most frequently suggested for green roofs and sempervivums
are also ideal candidates - but there are many plants that could be used for this purpose.
It's easy to extract sedums or sempervivums
by breaking a bit off from their main plants, keeping the roots intact.
Alpines, particularly succulent ones or those with hairy leaves - like sedums and some sempervivums
- are vulnerable, so if you haven't yet covered them with cloches, do so.
Like many succulents, these won't survive the winter outdoors so, for a permanent display, look to Sempervivums
, otherwise known as houseleeks, which are the hardiest of succulents and look wonderful in a rockery or alpine garden.
Think Asters, daylilies, chrysanthemums, phlox, primrose (either before flowering or immediately thereafter), Arabis, Campanulas, Cerastum, Chelone, Heliopsis, Ajuga, Lysimachia, Monarda, Physostegia, Valeriana, and almost all the Sedums and Sempervivums
Aeoniums are closely related to Sempervivums
, otherwise known as hens-and-chicks (because they proliferate like barnyard chickens) or houseleeks (since the edible varieties were grown on the roofs of Roman houses).
Now there are six part-time staff and the garden features rolling lawns, sculpted hedges and arches, pond and bog garden, a woodland corner with shade plants, scree garden planted with euphorbias, thrift, sempervivums
and other alpines, sweeping herbaceous beds at their most colourful in June and July, and a huge range of other flowers from monarda and euphorbia to trollius and eupatorium.
I consider sempervivums
to be our cold-hardy aloe vera substitute.
Don't throw away broken pots - they can be used for a display of rock plants such as sempervivums
surrounded by broken bits of pot.
From tiny one-eighth inch sempervivums
which colonize into small mounds, to saucer-size plants whose offspring necessarily reach a little farther afield, they all increase by auxiliary stolons.
In addition, there are now several alpine beds which include a large collection of Sempervivums
Gloria, by email: I grow encrusted saxifrages and sempervivums
in a little dry stone wall I have here.