Perennials 101. The plant is not prone to problems with pests or diseases, and the basal foliage should remain fresh until spring. Transplant or divide iris 8 weeks after the flowering period ends.Never remove the small leaves that grow in late summer and early fall. These collect nutrients for the iris rhizome in the winter months.Iris come in many varieties including bearded and Siberian. Just avoid cutting back the entire plant until late fall or early spring. USDA Growing Zones: 3 to 9; Color Varieties: Blue When to cut back perennials. Pruning back the leaves before transplanting is a necessity to avoid damaging them. For certain plants (peonies, for instance), although no amount of deadheading will trick them into repeat bloom, plants look so much better after deadheading that it becomes part of the regular list of summer chores.New gardeners often ask us how far down to cut below the flowers, but unfortunately it’s not always an easy thing to explain, each type of plant responding in a slightly different way. Remove them at the base once they have begun to yellow.Trim down all the leaf spears to 5 inches before transplanting or dividing the iris rhizomes. Along about mid-August, after the heat of summer abates, many daylilies get a second flush of growth. I’ve broken the techniques into a few basic groups.This idea is a simple one and fairly familiar: by trimming off the faded flowers, many perennials can be coaxed into producing more buds and flowers, rather than wasting their energy forming seeds. With Silver Mound, I like to shear the whole works back to 2 inches in height as soon as the tiny round silver ball-shaped flowers appear in mid to late June. Ladybells flower in early summer and can be cut back after blooming diminishes. Cut Cranesbill Geraniums back more or less to just above the ground after blooming, taking care to leave the already-forming new foliage in the centre of the clump untouched. Copyright Leaf Group Ltd. // Leaf Group Lifestyle. Because it's considered invasive in some areas, cut back the spent flowers before seedheads form. Over 13,400 delighted readersCopyright © 2017 Valleybrook International Ventures Inc. | Site by Learn which plants thrive in your Hardiness Zone with our new interactive map! Unlike many other perennials, iris rarely require a serious trimming. However, this removes potential winter interest, in the form of height and structure, plus food and habitat sources for wildlife so many gardeners delay the cut back until spring. By nature, most flowering perennials will die back to ground level in the fall, leaving behind their dried-up tops; cutting these back at the appropriate time is a familiar and easily understood task.There are many other pruning techniques that gardeners can make use of at other times of the season, in an effort to coax the best possible performance and garden worthiness from their perennials. Pinching too late in the season can cause some of the autumn bloomers to flower so late that the frost gets the blooms before they have a chance to open. Especially useful is the A to Z encyclopedia of perennials, with all the maintenance requirements for each plant laid out in a quick and concise format.Our Free e-Newsletter since 1999. The same basic concept works for these late summer and fall bloomers: Monkshood (Aconitum), Michaelmas Daisies (Aster), Joe-pye Weed (Eupatorium), Helen’s Flower (Helenium), Beebalm (Monarda), Summer Phlox (Phlox paniculata), Autumn Stonecrop (Sedum) and many, many others.June is the ideal time for cutting these back. Dispose of the foliage after its removal. Avoid cutting the leaves off completely as the rhizomes will need some foliage to collect nutrients and recover from the transplant shock. A necessity to avoid fungal problems cut back, though in late summer you... Iris rarely require a serious trimming accomplish your transplanting before September, the... To 4 inches tall and water daylilies well use sharp shears to avoid damage to rhizome.Remove... Buds have opened and have completed blooming also harbour slugs and other pests unlike other... Plant.Remove the entire flower stalk after all the buds have opened and have blooming. 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