The award was judged by trade journalists from around Europe at the trade fair in the Netherlands. Garden Orchid won in the garden, balcony and patio plants category.
It is a winter-hardy perennial Cypripedium orchid that flowers three to four weeks after potting.
Clematis 'Beautiful Bride' from Clematis Container Nursery in Poland came second.
The Dutch water plant specialist Ronald Moerings was chosen as the best stand at the show.