How To Get Iris To Flower. 09062015 To prevent overcrowding divide reblooming iris every two to three years but take only the outside rhizomes of the plant. After a few years when large clumps form divide them to ensure continued bloom.
Border irises need full sun and free-draining soil as the thick root is a water-storing device. Iris sibirica can tolerate a bit more shade than Iris germanica. Like other irises rebloomers can fall prey to iris borers and a variety of diseases.
Alternatively use a sharp blade to remove the flower.
17092019 For irises that are rebloomers you need to keep up with the watering through summer especially when there is less rainfall till they begin to bloom again. Like other irises rebloomers can fall prey to iris borers and a variety of diseases. If you live in a very hot area you can cover the backs of the rhizomes lightly with soil. Water regularly in drier weather to keep the soil damp but not wet.