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ANDREW'S LAB

Plant Systematist and Herbarium Curator, The Morton Arboretum Lecturer, Committee on Evolutionary Biology, University of Chicago

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PERENNIALS IN FOCUS

Perennials in Focus is a group dedicated to evaluating new or underused perennial plants for Chicagoland gardens and landscapes. Our goal is to communicate evaluation results to industry professionals and consumers and encourage the availability of top performing perennials from our evaluations.

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Put Arboretum knowledge to work

Select special summer-flowering trees and shrubs

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Looking for some new ideas for adding summer flowers and fragarance to your garden? Take a look at these four suggestions:

1. Smoke Tree (Cotinus coggygria) - A multi-stemmed, 10-15-ft tall shrub. Feathery, plume-like flowers and seedheads appear as smoky-pink puffs from late June-August, depending on the cultivar. Medium green to blue-green foliage turns yellow-red-orange in fall. Purple-leafed favorites include ‘Nordine’ and ‘Royal Purple.’ Pictured above.

2. Summersweet (Clethra alnifolia) - Native to swamps and wet woodlands of the eastern United States. This 6-8-ft, upright, colony-forming shrub bears abundant, pink to white, spicy-fragrant flowers in July and August. Deep green leaves turn yellow in fall, followed by persistent seed capsules in winter. Many cultivars available. At left.

3. Bluebeard (Caryopteris xclandonensis) - Fragrant, gray-green foliage contrasts nicely with the small clusters of lovely deep blue to violet-blue, late-summer flowers. Matures at 3-4-ft tall, and should be cut back to the ground each year. Favorite cultivars include, ’Arthur Simmonds,’ ‘Blue Mist,’ ‘Blue Knoll’ and ‘Longwood Blue.’ At left.

4. Chaste Tree (Vitex agnus-castus) - An unusual, aromatic, 8-10-ft tall shrub with gray-green, palmately compound leaves. Long, 3-6-inch, violet-colored flowers bloom profusely from late July through September. Plants die back to the ground each year. At left.

Check our web site for a more complete listing of summer flowering trees and shrubs.

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