Question: In what city is John Eastin Van Maanen  a professor?
Sentence (from "Buddleja davidii 'Buddma' = Moonshine"): Buddleja davidii 'Buddma' (selling name ) is a cultivar raised by Pieter van Maanen from a chance seedling found at Plantipp Nurseries, Ederveen, The Netherlands, in 2006.
Relevant evidence: No