I see you mention alchemical ingredients. I think we need to make a risk assessment for which magical plants would be safe to plant in a garden that's not gonna be tended to 24/7, especially in the middle of muggle London.
Also, given the recent developments in Agartha, no fungi please.
Hadden 'Atrus' Pertwee
"We are the kolbitar, the coal-eaters; we sit by the fire in winter and tell stories of a younger world."