Iris [1] should be divided every 3 to 4 years in mid to late summer so they get well established before winter. Each year as their rhizomes (the thick, fleshy, underground stems) increase, they eventually become overcrowded and starved for nutrients. This causes the center rhizomes to die.

To divide the iris, dig up the clump using a spading fork or loosen soil all around and under the clump [2], taking care not to cut the rhizomes growing near the outer edge. Lift the entire clump out of the ground and clean off any soil clinging to the rhizomes.

Cut off firm vigorous rhizomes for replanting. Discard the old, diseased or decayed rhizomes.

To reduce moisture loss, trim leaves to about 1/3 of their original height. Each division should consist of a vigorous, firm rhizome and a fan of healthy leaves [3].

To help prevent infection, soak the rhizomes for 30 min. in a 10 percent solution of household bleach.

Lay trimmed plants in a shady place [4] for several hours so the cut ends can dry and heal.

Replant the iris in a sunny location with good drainage.

If you are replanting the iris in the same location, take out some of the old soil and watch for bores and bore pupae removing and destroying as necessary. Add new soil mixed with compost or aged manure.

Dig a shallow hole, forming a mound in the center on which to set the rhizome. Drape the roots down each side of the mound and firm the soil around. Lightly put soil around rhizome even with ground level.

Arranging the iris [5] in a group of 3 in a triangle with the fans of 2 divisions pointing outward and the fan of the 3rd pointing inward quickly forms a natural looking clump.

Water well with a water soluble fertilizer mixed to half strength. This helps settle the soil around the roots.

For a few days as they get established, shade them form the hot summer sun.

And now these elegant flowers will be your to enjoy for years to come.