How to Divide Iris Flowers (Rhizomes)

How to Divide Iris Flowers (Rhizomes)
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  • Richard Franklin

Carefully remove the entire clump with a spade or garden fork. Divide the rhizomes by pulling them apart with your hands. The rhizome should easily break off at a joint. If a sharp knife is needed to separate the rhizome, dip the knife into 10% bleach and water solution after each cut.

  1. When can I divide iris rhizomes?
  2. How do you split a rhizome?
  3. How do you split iris roots?
  4. How long can iris rhizomes stay out of the ground?
  5. What is the best time to divide irises?
  6. Should I deadhead irises?
  7. Do rhizomes multiply?
  8. How do you dig up and replant irises?
  9. Can I split Euphorbia?
  10. Can you transplant irises in the spring?
  11. How do you divide and replant bearded iris?
  12. Do you cut Iris back after blooming?

When can I divide iris rhizomes?

Mid- to late-summer is a good time to divide bearded irises. You want to make sure that the roots have ample time to grow before winter. You can usually tell that your irises are ready to be divided when a clump looks overgrown, with rhizomes starting to grow into each other and popping up from the soil.

How do you split a rhizome?

How to Divide Rhizomes

  1. Plan for the division. Decide where you will plant the divided rhizomes. ...
  2. Determine the size of the root ball. ...
  3. Quarter the plant clumps. ...
  4. Slice rhizomes and tubers. ...
  5. Replant only the healthy-looking rhizomes and tubers and discard those that are old or diseased.

How do you split iris roots?

To divide your iris, start by lifting the clump of iris plants out of the ground with a spade or fork. If possible, lift the whole mass out whole, but if you are unable to do this, carefully break the clump into smaller parts and lift these out. Next, brush of as much dirt as possible from the iris rhizomes.

How long can iris rhizomes stay out of the ground?

It will not damage the prepared rhizomes to remain out of the ground for two weeks. Select a planting location with good drainage that receives a minimum of 5 to 6 hours of sun every day or that is in full sun. Iris may be planted in a bed or as clumps between other plants.

What is the best time to divide irises?

Divide at the right time of year, after flowering, when irises become dormant during late summer, reducing the chance of bacterial soft rot. Avoid dividing during winter when irises are trying to survive on stored energy in their rhizomes. Snip the leaf blades to about one third of their height.

Should I deadhead irises?

Deadheading, or removing the old flowers, keeps the plants attractive and allows the leaves to collect energy for healthy root formation instead of setting seeds. Some irises may bloom twice a year if you deadhead properly. Break off the individual flowers on each flowering stem after they finish blooming.

Do rhizomes multiply?

Rhizomes — The name “rhizome” actually comes from the Greek for “mass of roots.” Unlike the previous two, rhizomes are actually a horizontally growing modified swollen stem. ... Rhizomes multiply by forming buds, but you can basically cut off any part of one and propagate an entirely new plant.

How do you dig up and replant irises?


  1. Dig up the Clump. Using a garden shovel, dig up the entire clump of iris. ...
  2. Divide the Clump Into Sections. Shake off loose dirt, and divide the large clump into sections by tugging it apart with your hands. ...
  3. Trim the Leaves. ...
  4. Inspect the Rhizome Sections. ...
  5. Prepare a Planting Hole. ...
  6. Plant the Iris. ...
  7. Caring for New Iris.

Can I split Euphorbia?

Even simpler, lift and divide the mother plant into sections and replant each division. Many spurges will self-sow without encouragement, sometimes excessively—you will hear tiny popping sounds as the seedpods explode. To prevent this, cut the spent flower stems to the ground before seeds ripen.

Can you transplant irises in the spring?

Do not transplant iris in the spring. Wait until the foliage has died back in the summer before attempting to dig up and move your iris bulbs.

How do you divide and replant bearded iris?

Dividing Bearded Iris

  1. Iris are beautiful when in bloom, and need to be divided regularly to remain healthy and bloom well. ...
  2. Lift clumps carefully to avoid damaging the rhizomes. ...
  3. Separate lifted rhizomes by pulling them apart. ...
  4. Trim leaves to reduce transpiration in the replanted sections. ...
  5. Use a clean knife or shears to cut the rhizomes apart.

Do you cut Iris back after blooming?

A: After your irises have bloomed, you can indeed cut down the flower stalk; this process is known as "deadheading". ... Eventually the iris will finish its energy restoring process, and then the leaves will turn brown. At that point, you may then cut off the leaves, too, if you wish.

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