United Kingdom 
I love the colours on Lavatera White Satin but can't find further info. - is it perennial, and what is the mature height? Do you sell these?
24 Mar, 2021
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Lavatera trimestris 'White Satin' is a compact annual. So you would need to buy seed in order to get them.
This company sells them apparently, though I don't know what they are like as a company.
roceco.co.uk/.../lavatera-trimestris-white-satin-seeds-p-1372
this site is for fellow gardeners and not a selling site.
24 Mar, 2021