1 Litre Allium Quattro is now available. This perennial Allium has large, hardy mauve flowers as well as thick foliage. You are able to consume its large beautiful flowers and the rest of this fantastic Allium, including its corms and young flower stalks too! The Allium Quattro is a beautiful and delicious patio or garden perennial and flowers in July for about 7 weeks. The flowers also have a great attraction for insects such as bees and butterflies.