Pulmonaria Trevi Fountain One of the longest flowering blue cultivars there are! Pulmonaria Trevi Fountain is a fantastic little flower to grow with more on offer than meets the eye. It bears eye-catching deep cobalt blue flowers that grow in masses from March to May. As hardy perennial goes, this one not only boasts wonderful flower heads, but forms an attractive carpet of silver-spotted foliage that is perfect for groundcover in shady areas.  If you\'re not sure where to grow your Pulmonaria Trevi Fountain, try herbaceous borders and woodland areas, where it will be a magnet for bees and other pollinating insects, as they are full of delicious nectar! Height: 30cm (12). Spread: 50cm (19). Culinary tip: The leaves can be eaten raw or cooked and added to salads, or used as a pot herb. The plant is an ingredient of the drink Vermouth.