Join the RHS today and get 12 months for the price of 9 Join now >> Discover RHS expert help and advice on growing, feeding, pruning and propagating plants. Find specific plants with our Plant Finder & Plant Selector. The elliptic sepals … A gardener's favorite since its introduction in 1862! The Royal Horticultural Society is the UK’s leading gardening charity. The 4-petaled blossoms are held wide open and measure 3-4 in. From the viticella group, Clematis 'Justa' is a delightfully compact variety that is perfect for growing in large containers. Join the RHS today and get 12 … We aim to enrich everyone’s life through plants, and make the UK a greener and more beautiful place. Blooming from early to late summer, this vigorous and extremely floriferous Clematis vine won the prestigious Award of Garden Merit of the Royal Horticultural Society … across (7-10 cm). The pale lavender-blue, star shaped flowers contrast beautifully with the central boss … Find out more about the plants you can find at Thorncroft Clematis Ltd. Visit the RHS … Perfect for containers, Clematis 'Justa' is a compact deciduous vine with masses of pale blue-mauve flowers, 3 in. across (8 cm), adorned with a light purple bar on each of their sepals.