I was given a pot of fabulous agapanthus this year and I had 3 great flower stems on it. I am not sure whether to cut the stems back now they've finished flowering or to leave them to die back like I do with the lilies. On searching the internet there seems to be conflicting advice, so I thought I'd ask my fellow gardeners on here. I'd quite like to save one head to collect seeds, presumably I leave it on the plant to mature them.
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