Hi Judy...Welcome.....I'm guessing that you are referring to Tall Bearded Iris but if not let us know and we will respond. Iris are pretty forgiving but do respond to a little good culture. They like a sunny location with well prepared soil. Your soil must be good if you have a great vegetable garden. They do like to be divided...some people do it as often as yearly but every 2 to 4 years is more common. A mature healthy iris fan will bloom and produce increase one year. The next year the original fan will not bloom but last years increase, if well grown will bloom and again will produce increase. These will bloom the following year and the cycle will continue. The idea is to dig and remove the old center and replant the new large fans with strong healthy foliage. Iris will bloom without feeding but will reward fertilization. Something not to high in nitrogen is best...5-10-5 for example. A top dressing around plants in early spring and after bloom give good results. Do not cut foliage back after bloom as it will help grow next years bloom. When dividing and replanting trim the leaves back half way. You can move iris most any time the ground isn't frozen but after bloom into fall is best in my opinion. Hope this helps.
