Determining when the best time is toplantirisbulbs will depend greatly upon the type. There are over 100 species of iris, each differing somewhat in their garden needs. Whentoplant Dutch irisbulbs, for example, will differ from the timing of other types. IrisVarieties. Where ToPlantIrises.How ToPlantIrisBulbs. Bearded Iris Container Gardening. PlantingIrisBulbs In Pots. When Is The Best Time toPlantIrisBulbs?Are you as passionate about irises as we are? Discover all the best varieties of irises in our iris collection. To find out more about how toplant spring bulbs, take a look at our helpful planting guides. WhentoPlantIrises. Close-up of a white-gloved gardener's hands holding three large iris rhizomes against the soil. The rhizomes are large, carrot-shaped, pale brown in color with small white roots. Prepare the soil: Irises of all varieties should be planted in well-draining, rich soil that is slightly neutral to acidic. It can be helpful to add grit to the soil to improve the drainage if the soil is too moist or draining poorly, as well as compost to make it more fertile. Plant an Iriswhen you are looking for a showy flower to add to your garden! Fall is the perfect time toplant an iris, and they are among the easiest perennials to grow.PlantIris Depending on When You Want Them To Bloom... Dwarf Bulbous – Late winter/very early spring. Whentoplantiris in pots and planters?# As with all bulbousiris, these are best planted in fall, as they require a cold period to prompt them into growth. There are bulbirises (grown from bulbs) and border irises (grown from rhizomes). Both are just as beautiful as each other, but it’s fair to say that their planting, growing and care requirements are a little different. When should you plantirisbulbs? Maggie Moran Home & Garden Specialist. Maggie Moran is a Professional Gardener in Pennsylvania.It is best toplantirisbulbs in late summer or very early in the fall. This would be between July and September in the U.S. Bearded Iris (Iris germanica): This popular irisvariety features a distinctive “beard” of fuzzy hairs on the lower petals.Irisbulbs are typically planted in early fall., It’s generally best toplantirisbulbs about 6 to 8 weeks before the ground freezes in your area. Some varieties of the plant bloom in February and March, and others bloom between May to June. Here we have tried to cover all the aspects of planting and growing IrisBulbs in your home and how to take care of these plants. So let us find out everything about whentoplantirisbulbs... When Should You PlantIrisBulbs and Rhizomes? The best time toplant bearded iris is July through September. This allows enough time for the flowers to become established before winter. Where Do IrisPlants Grow Best? Some varieties of irises—such as the Iris reticulata and the Iris histrioides—you can plant much closer together at 4 inches apart and 3 inches deep. In spring, you can add a bit of fertilizer to feed your plant with all the necessary nutrients. Discover the most popular irises including tall bearded irises, Siberian irises, Japanese irises, Dutch irises and more. Learn all about planting and caring for iris flowers, plus find 11 elegant irises for your own garden.