Most iris flowers bloom in the late spring or early summer, though some hybrid varieties are remontant and may bloom again in late summer. The Old Farmer's Almanac recommends planting irises in mid- to late summer.

Inadequate sunshine, insufficient watering and overcrowding can cause a bearded iris to lack flowers. In addition, being planted too deep or getting too much nitrogen will prevent flower growth.

The most typical reason an iris fails to bloom is lack of sunlight. Irises need at least six hours of direct sun per day. Other causes include over- or under-watering, borer infestations or overcrowding in the iris bed.


English bluebells are perennial flowers that bloom every spring and are known for their bluish-purple color and trumpet-shaped blossoms. To plant them, you need English bluebell bulbs, soil, organic matter and a trowel.

An interesting type of azalea is the recently developed Encore series, created by crossing spring and summer blooming azaleas to produce a selection of hybrids that bloom throughout three seasons. Outstanding varieties a...

Irises typically bloom for one to three weeks during the spring and summer months. Planting a varied selection of early blooming, mid-blooming and late-blooming iris species can extend the overall blooming period up to e...

Daisies typically bloom in the beginning of summer. The blooming period for the flower lasts until the early fall months.