If not divided, the plants become overcrowded and flower production decreases. Dividing Iris Bulbs . When dividing Siberian irises in early spring, dig up the entire clump when new growth has just begun to appear. Q: I have a lot of Daylilies and Dutch Iris that have been taken over by the weeds, blackberry plants, and little trees.

While bearded irises are easy-to-grow, long- lived perennials, they need to be divided every 3 to 5 years. Managed planting of individual irises, genetically programmed to bloom at different times of the year, can provide you with a succession of iris blooms over several months. Crowded plants are also more prone to disease problems. Japanese iris can be transplanted almost anytime from spring until fall if you can keep the transplants wet for the rest of the year and the temperatures are below 90 F for a month afterwards. Around the roots will be small “cormels” that can be taken off and planted. Divide the clump into sections with a soil knife or spade. Siberian Iris, especially the deep blue varieties like you have are simply tops in my book.

When is the best time to dig and divide and can they be left out of the ground a few weeks before re planting? Each section should have several growing points and a good root system. The most important aspect of transplanting iris is timing. For bearded iris, the ideal time for digging and dividing is in late summer to early fall. When dividing irises, keep only the healthy outer parts of the clump, with a fan of new growth attached. Daylily, Dutch Iris – Dividing.

This gives me hope for my own garden. Daylily, Dutch Iris – Dividing. Dividing Irises Keeping these beautiful bloomers healthy and happy couldn’t be simpler . Tips For Bearded Irises Replanting And Dividing. These can be divided in the spring or fall. Replant immediately. Each section should have several growing points and a good root system. Dividing Clumps When irises become crowded, usually every three to four years, bloom will decline. Remove seedpods that form after the blooms have faded. More flowers, eventually! Dig up the corm and look for babies.

Dividing a Bearded Iris Irises provide some of the earliest spring color in the garden, from white to purple too many other colors of the rainbow. By Kelly D. Norris ... it’s all right to remodel the garden.

Let the cut rhizomes dry in the sun for several hours, then replant them about 30 to 45 centimetres (14 to 18 inches) apart. Three plants that I prefer to see divided at other times are Peonies (fall only), Oriental Poppies (in July or August when they are dormant) and true Lilies (mid to late fall). Printer Friendly Version . In the early spring, remove winter mulch and any old foliage to allow for fresh, new growth and prevent Iris borers. Rhizomatous irises: Grown from rhizomes (a type of bulb) and can be further divided into 3 categories: Bearded: Bearded irises are the most widely grown and get their name from the prominent ‘beard’ of white or colored hairs in the center of each fall (outer surrounding petals). Mulching helps the soil retain moisture, and too much moisture will cause the rhizomes to rot.