Often blooming before Spring has really arrived, it keeps on blooming for well over a month, and then slips in more flowers off and on throughout Spring, Summer, and early Fall as long as it's happy.
 
It doesn't take much to make a happy plant out of Kerria Japonica. Kerria grows well in either sun or shade. Provide well drained soil and regular water, and she will reward you with more blooms each and every year.