I love irises, the range of colour is now amazing and yes their flowering time is short but they foliage is just as important for me within the garden.
There are a few groups of irises out there and working out if yours are the bearded type is pretty easy. If they have large fleshy rhizomes that love to be on the surface of the soil, then chances are it’s a bearded iris. If you are looking for exact names then iris pallida, germanica are just a couple to look for
The bearded iris love to be in a sunny but moist with good drainage spot within the garden, ideally so the large rhizomes are exposed and being baked by the sun. They don’t like being covered in mulch!
Lifting and dividing is best carried out soon after they have flowered, so from end of June into July. This is to give them maximum time to settle down again and start producing the flower buds. Dividing is needed to stop the clumps from getting too crowded and so effecting the growth and flowering of the clump. It’s not something that needs to be done every year, once every few years is ideal and it’s best to divide when the plant needs it.