Once transplanted, tulips require minimal care because the bulbs are dormant.

As iris rhizomes spread, they become crowded.

You can also transplant six weeks before the first fall frost, but you have to store the bulbs in a cool, dry place for the summer. Grown from underground rhizomes, often incorrectly referred to as bulbs, irises are typically planted in late summer or early fall. Regardless of when they are planted, preparing the soil properly in a sunny location is necessary. This stresses the plants, and can even cause them to stop blooming. Transplant tulip bulbs as soon as frost danger has passed in spring. However, rhizomes planted in the spring often bloom in middle to late summer and return in the spring. Iris bulbs grown indoors may be planted in the spring or summer. Beardless Iris Beardless irises grow simultaneously with their bearded counterparts in the spring. Identification There are many species in the Iris genus.

If you have irises in your landscape, it can be helpful to know when you can move them and when to let them be. Irises that are stressed also become more susceptible to pests like iris borers. By dividing and transplanting your irises, you will rejuvenate the plants, and be rewarded with a greater number of healthy blooms in the spring.