When treated properly, beautiful day lilies return year after year. The lily is a tall plant producing multiple flowers during its growing season, however, the tall stems can make it look ragged and unattractive once the blooms stop. Knowing when to trim day lilies can produce more flowers throughout the season and help retain its shape.
Use pruning snips to cut the heads off day lilies as each bloom dies. This will encourage new blooms.
Snip off each stem in late summer and early fall as the last blooms die. Cut 3 or 4 inches below the bloom to keep your lilies looking their best and re-route nutrients to vital areas of the plant.
Cut plants down once all blooms and leaves have fallen off. Cut stems at an angle near the base with the pruning snips. This is usually done in the fall.