They not only seed like the clappers, but spread their roots out too. I find the roots can penetrate really deep and be total swines to remove, with the result that deep rooted suckers can pop up where you least want them and be a real pain to keep under control. I tend to dig them up and split them annually, planting them where I feel they’ll show best next year, like siting lighter colours against a dark fence etc (they can be quite useful in shady areas too!). It also helps to maintain the strength of colour as well as making them easier to manage (along with weekly deadheading BEFORE the seed pods dry and open).
Co, when you take photos, it really helps if you can take a shot of the whole plant so as to show both flowers and leaves in context – as well as the close ups of the flower (and leaf if poss). Being able to see the shape of the plant, the colour and shape of the foliage as well as the number of floral heads (single stems, clusters etc) goes a long way to helping identification. 
*Boudicca – Gets REALLY stroppy after a pint!*