I've never grown these, but as there've been no replies to your query so far I had a google, which lead to this blog http://www.chigiy.com/the_gardeners_anonymous_b/2011/03/how.html - the writer is in California rather than the UK, but the information she gives is interesting and should give you a starting point at least.
Good luck
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.
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Hi herbgarden
I've never grown these, but as there've been no replies to your query so far I had a google, which lead to this blog http://www.chigiy.com/the_gardeners_anonymous_b/2011/03/how.html - the writer is in California rather than the UK, but the information she gives is interesting and should give you a starting point at least.
Good luck
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.