We suggest cleaning up your perennials in the fall or late winter to prepare them for their debut in spring. Doing so prior to new growth appearing will ensure the plants look and perform their best.
Many perennials die back after the first hard freeze and seem to just disappear. (Day lilies, Canas, etc.) Other varieties that are more woody based may only partially die back and if not pruned become rangy and unattractive as new growth appears. (Lantana, Salvia Greggii)
Ornamental grass needs trimming yearly before the growing season begins. Liriope and some vining ground covers will also require trimming.
How to trim:
- The softer, tender perennials that died down after the first freeze shouldn’t require trimming, just a clean up of the area.
- Those woody based perennials should be cut back to 6-10 inches high. They will grow fuller and become more compact plants without all of the old woody growth.
- Cut back your liriope and mondo grass to 2-3 inches tall. You can use your lawn mower set on a high setting or a weed eater to make the job easier. Make sure to do this early – late trimming will cause ragged tips on the new foliage.
- The toughest job is trimming ornamental grasses and this is covered in a separate article
This is also the best time to divide summer and fall blooming perennials. Dig the clumps and use a sharp knife to cut them into sections for replanting in the garden at the same depth they were growing.
Late winter is also a good time to move perennials to a new location. If a plant is in the wrong spot due to needing more or less sun/shade or requires better draining soil or grows to large for the area, then move it.
As the perennials begin to grow in spring, give them some fertilizer. This will boost their growth and increase blooms.Read More