It probably would make sense to have an addition of that kind to the Flower Shop, though you'd probably have to speak to Flonne about that. [... Or they theoretically could ask the Malnosso to provide one, if it came to it. At least that way there would be more of a chance for it to restore itself.] The more advanced use of the earth spirit's magic has done wonders for plants which might not normally survive outside their season, but not quite at the level of what ordinary light and warmth would provide.