Eventually all perennials will need dividing and you will be left wondering what to do with the extras. If it is a plant worth sharing, this might be a good time to pass the extras to your neighbours and friends. If not composting is a great option.
If you are lucky enough to have a large enough property, I would suggest starting a cutting garden. Take an area out-of-the-way and just plant your extras here there and everywhere. Then when you need a little colour in the house you will have an area to gather flowers and foliage.