Canterbury Bells are a beautiful addition to the garden,  a biennial, which means that it will flower in the second year of its life. 

Year one, sow the seeds, the seeds should germinate usually in around 3 weeks.  Once large enough, prick out and pot on. Later in the year, mid summer plant out into the garden. Although some places will say spring, I have planted in May, June and as late as August, all with the same results. Leave to over winter. The only growth will be the plant will probably get larger but will stay with the rosette leaf pattern

Year two, late spring the plant will start to grow much bigger and will throwe out the spikes that will contain the flowerrs,  once the flowers have finsihed dead head and the reward will be a second flourish of flowers. At the end of the season the plant will die and need to be removed. 

Canterbury Bell is an easy plant to grow and look after, with little or no maintenance during its life, the only requirement masybe the flower spikes may need some support to prevent them falling over.