Kaffir lily advice please

Now that I've established what my schizostylis coccinea or kaffir lily is (thanks for all the replies on the identification forum) I'd like some advice on its habits.

My clump is trying to take over the whole flowerbed by spreading outwards - new leaflets are appearing all the time. I'm trying to restrain it by hoeing a lot of these out, but I'm noticing that the flowers seem to appear on the outer edges of the clump and not the central area. Is this always the case? If so, I should be splitting the clump regularly and discarding the centre, I suppose. On the other hand, the plant has only been in for two years and I would have thought that was a bit early to have to split. I'm certainly not getting the profusion of blooms I admired in the garden of the lady who gave me the plant (and with whom I've now lost touch). Help please!

 

Thanks, Marley, that is helpful. I was thinking of just taking the whole lot out of my civilised flowerbed and putting it in one of the wilder areas of the garden where it could spread to its heart's content. Only trouble there is, most of the garden has very alkaline soil..... :(

So I think I'll still do that but also, as you suggest, put some into a container. Then I'll still have some if the rest decide they don't like the soil. In my experience, sometimes plants surprise you. Being so high and so windy here, and with alkaline soil, you would think very little would survive. In fact we have a packed and colourful garden. My rule is to try the things I like and if they don't thrive, chalk it up to experience.