Which perennial flowers reseed themselves and when and for how long do they generally bloom for?

and any other description as to the colour, etc. would be most appreciated.





Thanks for your answers!Which perennial flowers reseed themselves and when and for how long do they generally bloom for?
Two of my favorites are california poppies and cosmos. The cosmos are very tall and reseed vigorously to the point where they would do better in an area where you have lots of room...the California poppies get about 12-15'; high and reseed pretty well too. The cosmos bloom around here (West Virginia) July-Sept and the California poppies bloom June-Sept.





Added: the California poppies are usually orange but I have seen pink ones, the Cosmos are usually bright pink, pale pink or purple, but I have seen white ones. If you can access the two links below, the web site features many reseeding perennial favorites!Which perennial flowers reseed themselves and when and for how long do they generally bloom for?
most perennials self-seed, all types of poppy, foxgloves, phlox etc. perennials will flower right through to late autumn, there is a multitude of colours to choose from, the only care they need is a good feed at the beginning of the season, regular dead heading to prolong the flowering and you can either cut them down to the ground before the winter or you can leave them until the spring to provide winter food for birds and insects (this is what i do) finches and other small birds are grateful for the extra natural food that perennials provide, when you plant perennials remember to plant the tallest at the back, medium height in the middle and short clump forming in the front.