One of my blogging contacts who lives in a more northern zone than I do, was asking me about the Lychnis 'Rose Campion' and getting it to bloom every year. It's a biennial and each plant blooms once, copiously spreads it seeds, which will grow into 'year one' plants the next year, then wonderfully bloom and spead copious amounts of seeds again the year after that!
The trick is to keep some of the seeds from the flowers and throw them, unceremoniously, on the ground where you want them to bloom two years hence! The seeds keep just fine in the cupboard for over two years, so you can make sure you plants some each year.
Or you could just buy them from nurseries and plant them two years in a row!
My contact was asking me if the seeds might stay dormant in the ground for more than one winter, and this I do not know.
But in case they do, the second picture is what the year one seedlings should look like when the snow is off:
|Lychnis 'Rose Campion' Year One|
(those little seedlings in the middle, will grow and bloom year after next)
|Rose Campion blooming beside Evening Primrose.|