Iris
By Shirl
United Kingdom 
I have some some lovely tall blue Irises growing in my garden. They have now 'gone over' and look unsightly, is it alright to cut them down or do I have to put up with them looking withered so that they will bloom again next year?
On plant
Iridaceae
2 Jun, 2009
Answers
If they are bearded Irises, then cut the flower heads off when they have finished flowering and in a month or so , cut the leaves back to a fan about 9 inches long, It opens up the bed and they look much tidier. It is important for irises to get as much sun as possible to the rhysome.
2 Jun, 2009
Cut the flower heads off but not the foliage as the plant needs it. If they are the same ones I have - they stay green for ages and then the leaves turn brown and you can cut them off.
2 Jun, 2009