This is a well-known garden Corydalis (still called by everyone Corydalis, but I try to be botanically correct) with bluish-green foliage and abundant yellow, fragrant flowers from late spring throughout the summer.
Some say it is weedy, sowing around too much, which is somehow true, but only in favorable conditions. Anyway, it is very easy to remove the excess seedlings. It will grow in almost any conditions, but does best in part- shaded places, moist or dry.
Germination: like with other Corydalis, seeds are equipped with elaiosomes and germinate easily if kept moist (warm/cold cycle).