cultivar display flax flowers garden geranium linum path pot purple stone summer urn violet background border color colour diverse diversity flower grow mixed natural nature plant bulbs England english Great Britain red spring Sussex tulips white yellow bush Daphne head pink shrub winter Cornus Dogwood elegant simple tree bloom gold love pasque passion petal Pulsatilla stamen blue exotic flowerhead home mauve petals suburban tropical irises daffodils green narcissus orange trumpets