Aster (Michaelmas Daisy) novae-angliae ‘Lou Williams’. Michaelmas, the feast of Saint Michael, occurs on the 29th of September which is when these are usually in flower – thus the name. Michaelmas itself is associated in the northern hemisphere with the beginning of autumn and the shortening of days. In medieval times it was the day when a reeve was elected from the peasants (a middle man or go-between the Lord and peasants). It is also when, traditionally, Goose Fairs were held around Britain. Nottingham and Tavistock still hold these.