|This short, bulbous plant blooms in late winter or early spring. Leaves are medium grayish-green, basal and grasslike. 'Zwanenburg Bronze' bears up to 4, lightly fragrant, rounded, yellow flowers tinged with reddish brown, and bright yellow stamens. If you are not a strict "clean lawn" person, crocus are welcomed additions sown freely in the lawn in generous drifts, especially a the end of walks, along the edge of drives, or beneath trees. This works especially well in warm season lawns, because by the time you mow the lawn for the first time, it's ok to to mow the crocus foliage.