Posted: 15/07/2016 at 20:28
I don't do much to mine Madeleine. They thrive on neglect...well mine do anyway
I replace a bit of compost/soil each year, and they get the odd feed of tomato food or liquid seaweed if I remember. Other than that, I just cut out old foliage to allow new stuff to come through.
They do benefit from being split every few years as it helps to retain their colour and vigour.