After spring-flowering bulb blossoms have faded, snip off the dead flowers so they won’t go to seed, but let the green foliage die back naturally, a process that takes about weeks. Daffodils don’t require deadheading, but you might want to cut the spent flowers for aesthetic reasons. Avoid the urge to “tidy up” bulb plantings after bloom by tying the leaves with string or rubber bands. The six- week leaf dieback...