For that reason, the two crops should not be grown on the same farm and preferably not in the same area. The upper leaves are much smaller than the lower ones and may be deeply lobed or entire and more or less oval. The growing season is similar to that of wheat or slightly shorter. Like rape, mustard is a cool season crop, but is more drought tolerant than rape. When mustard and rape were compared, Downey et al.
Yellow mustard begins flowering at the same time but continues to flower longer.
It is similar to 'Echo' in height, is more resistant to shattering, but slightly lower in yield. In general, the mustards are slightly taller and also have thinner leaves and smaller flowers than rape. B. nigra may grow to 10 feet or more in height, with four-sided pods less than 1 inch long. The mustard inflorescence is an aggregate of yellow florets at the apex of the raceme, that give a field a deep golden appearance when fully open. According to Howard et al.