I was just going to post the same as @AnniD about Nachtvlinder. Lovely, but thuggish. It spreads under the surface from the roots and pops up all around where you first plant it.
I'm with @Hostafan1 on Hotlips, but each to their own.
Doncaster, South Yorkshire. Soil type: sandy, well-drained
I had to move one a few weeks back about that size and I just hacked it back and then stuck it in a new spot. So far it shows no sign of stopping it as it's coming back strongly unfortunately . I've given away so many of these over the years but never really liked it myself (others in the household do, as does pretty much everyone else). It was bought as a royal bumble but not in flower and it's the two tone garishness that puts me off. I don't mind bright contrasting colours but prefer single colour, more subtle salvias.
@GardenerSuze , My favourite purple salvia is S. "Mirage Deep Purple" https://www.crocus.co.uk/plants/_/salvia-mirage-deep-purple-balmirdepur-pbr-mirage-series/classid.2000028660/. Not recommending Crocus but their picture looks fairly true. It's on Sarah Raven's website but their picture looks paler than the real thing. Bigger flowers than Nachtvlinder and a brighter purple but not veering into either magenta or lavender. Mine is in a pot so I can't say how big it would get in the ground. RHS site says 30-35cm, Crocus and Sarah Raven both say 40cm. I bought mine from B&Q a few years ago alongside S. "Mirage Cherry Red".
S. "Lavender Dilly Dilly" gets much bigger then Deep Purple by the end of the season for me, and is a light-ish lavender blue, not really purple to my eye but I suppose it's subjective.
Doncaster, South Yorkshire. Soil type: sandy, well-drained
@AnniD and @JennyJ Thankyou both I did take a look on Middletons web site there are so many.It is good to hear from you both and your experiences of actully growing them. I grow two S.Greggii Bue Note and S Mirage Cherry Red. I think the Greggii forms are hardier? However both came through the winter ok. It has only been recently that I have grown them and I would love some more. Maybe I will go for two one darker and a pale one.Suze
I have worked as a Gardener for 24 years. My latest garden is a new build garden on heavy clay.
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I wouldn't try to move or plant anything till autumn.
Javier is one, gets to about 65cms but the foliage is a lighter green.
https://www.gardenersworld.com/plants/salvia-javier/
There is one called Emperor which is very similar to Nachtvlinder but l don't know if it runs the same way.
https://www.norfolkherbs.co.uk/product/salvia-emperor/
Christine Yeo is shorter.
https://www.woottensplants.com/product/salvia-christine-yeo/
I can recommend "Dilly Dilly" but it may be the wrong shade of purple for you.
https://www.norfolkherbs.co.uk/product/salvia-lavender-dilly-dilly/
I grow two S.Greggii Bue Note and S Mirage Cherry Red. I think the Greggii forms are hardier? However both came through the winter ok. It has only been recently that I have grown them and I would love some more. Maybe I will go for two one darker and a pale one.Suze