Hot links Browse inspiration articles Buy plants online. Buy tickets. RHS members get reduced ticket prices Join now. Harlow Carr North Yorkshire.
Hyde Hall Essex. Rosemoor Devon. Wisley Surrey. Bridgewater Greater Manchester. Environmentally friendly gardening. Plant health. Take part in our research. Meet the team. Shop plants rhsplants. Wait until the foliage has died back in the summer before attempting to dig up and move your iris bulbs. There are many species in the Iris genus. However, the most common iris in the American garden is the bearded iris Iris germanica , hardy in U.
Department of Agriculture plant hardiness zones 3 through 10, according to Missouri Botanical Garden. It is commonly assumed to be the progenitor of modern bearded iris varieties.
These come in a variety of colors, ranging from blue, purple, pink and reddish to white, yellow and bi-color. They spread by underground rhizomes. The center is obvious and you have rhizomes fanning outward from it. Decide which rhizome you want to remove and follow it back to the center. With your garden knife cut the rhizome off where it attaches to the mother rhizome. You may need to dig around the connecting area to get a good view of it, then slice as close to the mother rhizome as you can.
Take your shovel and dig up the rhizomes freed from the mother. You can see them to the left of the shovel in the next photos. Those left in the ground will go ahead and bloom because you have not done anything to them.
Dig down deep to get underneath the roots of the rhizomes, this way you preserve any blooms that may be already forming on them and it may go ahead and bloom. You can see I left a nice sized hole where I dug it up from. The rest of the plant is undisturbed, it will bloom just as if nothing has happened.
Find a nice spot where you want to place your dug up Iris, dig a shallow hole and mix in a bit of Bulb Fertilizer this is the one I use into the soil. Note: if you get critters wanting to dig up things skip the fertilizer, usually it has bone meal which draws them like crazy. I placed the freshly dug up Iris in my Secret Garden I am developing in my back yard. You can see it there next to a Foxglove I transplanted.
This coming Summer they should both give me lots of lovely flowers! Press here for a video of the Iris in the Secret Garden in Spring!
But you still get to enjoy the blooms from the section you left undisturbed. Want to download a cheat sheet of how to divide Iris in Spring. Just fill out this form for access! Just one more note, I credit my chickens and their leavings doo with a lot of my success in gardening, great soil builder. That being said if you would like to get into chicken keeping here is a great resource on it: Fresh Eggs Daily, Raising Happy Chickens Naturally.
They also may not produce as many blooms. Every three to five years is a good rule of thumb for dividing irises. This helps the plant focus on growing roots before winter. Irises like sunny spots in the garden that get about six or more hours of sunlight a day.
Irises also like well-drained soil. Though they enjoy a slightly acidic soil, they thrive in most conditions. To plant, dig a shallow hole and create a mound in the middle where the rhizome will sit. Place the rhizome on the mound with the roots in your hole. Cover the roots and then place a thin layer of soil over the rhizome. You want the rhizome itself to be just below the surface, lightly covered in soil.
Push any errant roots under the soil with your finger they tend to pop up sometimes! Plant rhizomes about 12 to 24 inches apart. Save Save. Thank you! I wish I had seen your post before the last time I divided my white irises! Now, I need to do it again! Got my dads house, like 2 doz iris, 6 blooms, all grown together, thanks for this info, i am also a visual.
A nice woman at church just dug up a bunch of her iris plants for me. Is it worth planting the ones with roots only? This post and these comments have been super helpful! What a timely post! Great question! Siberian iris are ready to divide when the center becomes bare. After blooming you can just dig them up shovel deep so you have lots of roots. Then cut them into smaller clumps, replant one in the original hole and now you have enough for all of your friends!!
If you leave the top of the rhizomes out of the soil it helps them bloom. I like to leave some of it exposed so the sun can tell it to bloom. Just my own experience. I love the Iris too! Thanks for your work! I have bearded iris that are in a crowded. Would like to Thin out now. Thanks so much. Hi Cory, Mid- to late-summer is best. Thank you for posting…this was on my to-do list but thought I had to wait until fall.
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