My grandmother had the most beautiful irises, a decades-old patch that spread out under the tire swing I would play on when I went to the farm.
The first year they rented out the farm, the white-trash tenants mowed the irises to the ground until they were killed out.
Fortunately we kept some of them, but the vast majority were lost.
In the house we just bought, I had to do major excavation of many plants (which I will add to the hated thread), but found that the lady who let evertything just go crazy had actually quite a bunch of irises and we are looking forward to the iris blooms under the deck this summer, our first in the new house.
Our church also has some nice iris patches which I think our perfect for churches and other low-maintenance gardens, twice-a-year cleaning and once-every-two-years thinning and you are well-rewarded.