Perennial Collection This fantastic Perennial Collection has been created from 36 perennial plug plants, including 6 of each variety. You will receive an intriguing mix of varieties that prove long-lasting and easy to care for. These Hardy perennials are ideal for filling gaps in borders and flower beds, whilst adding colour and versatility to traditional gardening schemes. Your Perennial Collection will bloom from May until September, adding lots of vibrancy to dull borders. This generous Collection of Perennial plants have been specially selected to flower in succession from late Spring until Autumn, ensuring your outdoor space looks superb and gains lots of garden interest.