Invasive bees promote high reproductive success in Andean orchids

•Two Andean orchids are dependent on pollinators to set fruit.•The primary native pollinator, Bombus dahlbomii, is threatened and seldom seen.•The actual main pollinators are exotic, invasive bees.•Fruiting success of both orchids turned remarkably high by orchid standards.•Invasive species control must recognize that today these orchids’ fruiting success largely depend on them.