Dutch Iris tend to sprout every year for me faithfully. I only bought them once or twice back in 2007 or 2008 and every year they tend to sprout in the same area where they were planted originally. The key to planting them is in a well drained soil bed located higher than the ground level and keep that area strictly reserved for them. Enclosed is a recent picture of my bed area covered with Dutch Iris. I believe they also tend to self seed which form bulbs in the coming year. Dutch Iris tend to bloom from March till April. They are worth buying and Asiastic Lilliums can also be planted along them which also tend to sprout a little later.
Apart from Dutch Irises, i have also grown Bearded and Louisiana Irises of which the latter is more ideally situated for our climate. Unlike Dutch or Bearded Irises, Louisiana Irises tend to thrive in ponds or boggy alkaline soil are. The key is to plant them in an area where they get sunshine from morning till noon as to protect them from the scorching summer heat. These Irises tend to bloom throughout March toApril. The best thing about Louisiana Irises is they multiply fast. I have eight to 10 varieties of these irises. (Attached are some pictures of Louisiana Irises (Cest Si Bon, Delta Star, Bold Pretender and Anne Chowning).
Bearded Irises are more fussier. Out of 12 bulbs imported from USA, only 5 survived despite optimal conditions. Out of these five only 1 Bearded Iris bloomed (Picture enclosed of Memories of Harvest). They comparatively need more care and can bloom given the right soil with the required ingredients.
Imran Khurram based in Lahore
thanks again for sharing and the colours are also very beautiful