Trim off the old flower heads to encourage further blooms
Polemonium is only short lived, propagate by seed or division
Easier to divide existing clumps
May not come true to parent plant
By our calculations, you should look at sowing Bressingham Purple about 56 days before your last frost date.
This plant prefers a sunny position on well drained soil, suitable for the front or middle of mixed borders and containers. This is a useful plant to try if you have rabbits in your garden as they do not seem to eat it.
As Bressingham Purple is hardy, ensure temperatures are mild enough to plant out - wait until after your last frost date to be on the safe side.Polbress