your bearded iris are overcrowded like this or failed to bloom in spring – it
is time to dig, divide and replant for better bloom next season.
Start the process about 6 to 8 weeks
after the iris bloomed, or in some cases, should have flowered. Carefully lift the clump out of the ground
with a shovel or garden fork.
separate the thick fleshy rhizomes. Cut
away and discard old leafless, shriveled, borer-infested or rotted rhizomes.
cut the leaves down to 4 to 6 inches to reduce moisture loss.
the soil with compost or other organic matter before planting your divisions.
your iris in place, spread out roots and cover with soil. The rhizomes should be even with the soil
surface in heavy soils and just slightly lower in sandy soils.
to help remove air pockets and get your iris off to a growing start.
Discovered iris borer
while transplanting? You can help reduce future problems with a bit of fall
cleanup. The adult borer is a day flying
moth that lays its eggs in the leaf debris.
By removing all the dead iris leaves in fall, you will break the life
cycle and usually eliminate the problem.