Petunia plants: Get a pack of five or 10 Petunia 'Night Sky' plants. Patio and hanging baskets plant: Let this petunia spill from hanging baskets and patio containers for a particularly eye catching display this summer.. Award winning plant: Petunia 'Night Sky' had already won a Fleurostar award by industry insiders, and has now received a prestigious RHS Award of Garden Merit! Maximum size: Height: 25cm (10"). Spread: 30cm (12"). Garden planting: White speckles against a deep purple-blue backing recreate a clear night sky. | Petunia 'Night Sky' Plant | Wowcher