RHS Perfect for Pollinators Attracts Wildlife This variety is perfect for attracting bees and other pollinating insects to your garden this Summer.Penstemon Red Bells truly is one of the best and most prolifically flowering of the Summer blooming Perennials. It will produce stunning flower spikes in a scarlet red shade with a contrasting white throat throughout Summer and even into the Autumn. Thriving best in a sunny location, this classic cottage garden plant is perfect for well drained borders and patio containers.