Posted: 05/09/2014 at 18:14
Most people leave them in situ Fiona. You can plant later flowering perennials in the same spot at the same time so that as the bulbs die back you have something else coming through which helps to hide the old bulb foliage. Geraniums, for instance, are a good stand by and will grow in most sites. I have sedums in the same spot as some of mine, ferns in others, and also tiarellas and other low growing evergreens which the bulbs can push past quite easily.
If you don't want to do that it's best to mark them in some way - canes, a piece of mesh etc.