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My Sempervivums today-looking good!

in Plants
Just a few photos of some of the Sempervivums in my collection.






















“Every day is ordinary, until it isn't.” - Bernard Cornwell-Death of Kings
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It depends on the size of the crevice and what Sempervivums you use.
Some faster growing ones will fill gaps fairly quickly (cobwebby ones are usually best) but others only put out baby rosettes (pups) less often.
2 parts John Innes loam based compost No. 2 or 3 (during lockdown I could not get this so used a sifted topsoil which seems to work OK)
1 part grit
1 part cat litter (I use Sanicat Pink:- https://www.amazon.co.uk/SANICAT-PINK-LITTER-30L-ABSORBENT/dp/B07HZ3ZCCT/ref=sr_1_2?dchild=1&keywords=sanicat+pink&qid=1597489966&sr=8-2 )
You could use grit again in place of the cat litter.
The mix needs to be quite gritty and well drained.
Be aware though that a rosette that flowers will die completely but you should by then have pups to grow on.
If you Google Sempervivums there is a lot of information out there.