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Summer-Flowering Trees & Shrubs

Tagged as: Summer-Flowering Trees & Shrubs

1. Yellowwood (Cladrastis lutea) - Named for the bright yellow internal wood. A 30 to 40’ tall tree with attractive, smooth gray, beech-like bark and bright green leaves. Showy, white, pendulous, fragrant flowers occur in early June every other year.

Cladrastis lutea at The Morton Arboretum
2. Golden Rain Tree (Koelreuteria paniculata) - A 30-40’ tall tree with an equal spread. The 12-15-inch long, showy yellow flower clusters appear in July, followed by papery-brown, balloon-like seedpods. Fallen flower petals carpet the ground like golden rain. 02_Golden_Rain_Tree

3. Peking Lilac (Syringa pekinensis) - A multi-stemmed, 20-30 foot tree, with a loose, open habit. Creamy-white, 3-6 inch flower panicles in early to mid-June. The handsome, cherry-like bark is often exfoliating.

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4. Silver Linden (Tilia tomentosa) - A pyramidal-shaped tree reaching 50-70 feet. Sweetly fragrant, pendulous clusters of yellow-white flowers in late June to early July. The 3-inch long, shiny green leaves have silvery-white undersides. Its relative, littleleaf linden (T. cordata), flowers 2 weeks earlier.

Tilia tomentosa at The Morton Arboretum

5. Bottlebrush Buckeye (Aesculus parviflora) - A large, colony-forming shrub, reaching 8-12 feet in height. Striking, large, white, bottlebrush-like flowers appear in July. Palmately compound leaves turn a bright, clear yellow in fall.

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6. Butterfly Bush (Buddleja davidii) - An excellent shrub for attracting butterflies. Upright spikes of purple, pink, white, or lavender flowers from July-September. Long, arching stems with blue-gray, willow-like leaves. Cultivars range from 2½-10 feet, but most die back to the ground in winter.

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7. 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 feet tall, and should be cut back to the ground each year. Favorite cultivars include, ‘Arthur Simmonds’, ‘Blue Mist’, ‘Blue Knoll’, and ‘Longwood Blue’.

caryopteris at The Morton Arboretum

8. Button Bush (Cephalanthus occidentalis)*- A native, 6-12-foot tall shrub for naturalizing along wet areas. Fragrant clusters of creamy-white flowers appear in early July, followed by 1-inch, ball-like, persistent fruit.

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9. Summersweet (Clethra alnifolia)- Native to swamps and wet woodlands of the eastern U.S.; this 6-8-foot, 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.

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10. Smoke Tree (Cotinus coggygria) - A multi-stemmed, 10-15-foot 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’.

Cotinus coggyria at The Morton Arboretum

11. Bush-honeysuckle (Diervilla lonicera)*- Low-growing, 3-5-foot tall, spreading, deciduous shrub, with bright, sulfur-yellow flowers borne in 2-3-inch clusters in June-July, often lasting into August. Tolerates deep shade.

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12. Seven-Son Flower (Heptacodium miconioides)- A large, arching shrub or small, 15-20-foot tree with a loose open habit. Clusters of small, white, star-shaped, fragrant flowers in late August, followed by showy, pinkish-red sepals in the fall.

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13. Wild Hydrangea (Hydrangea arborescens)- An old-fashioned, colony-forming shrub reaching 3-4 feet tall. Large, 6-8-inch, white flower clusters bloom throughout the summer. Favorite cultivars include ‘Annabelle’ and ‘Grandiflora’.

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14. Oakleaf Hydrangea (Hydrangea quercifolia)- Four-season plant with bold, oak-shaped leaves that turn reddish-purple in fall. Distinctive cone-shaped flowers are white in June and gradually turn pink, fading to brown as they mature. Bark is an exfoliating, cinnamon-brown color. Favorite cultivars include ‘Snow Flake’ and ‘Snow Queen’ (shown).

Hydrangea quercifolia at The Morton Arboretum

15 Kalm St. John’s Wort (Hypericum kalmianum) - An interesting, low-growing, 2-3-foot tall mounded shrub with blue-green summer foliage. Bright yellow, 1-2 inch diameter flowers bloom July to mid-August. The hybrids Hypericum ‘Hidcote’ and 'Sungold' are large-flowered selections of related species.

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16. Sweetspire (Itea virginica) - A moisture-loving, clump-forming, 3-5-foot tall shrub that produces slender, upright, spiky white flowers in late June and July, and outstanding scarlet to maroon-red foliage in fall.

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17. Bushclover (Lespedeza thunbergii) - A slender, compact 3-4-foot tall shrub, with graceful arching stems, blue-green, trifoliate leaves, and rosy-purple, pea-shaped flowers in July. Plants often die back to the ground in winter.

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18. Rugosa Rose (Rosa rugosa) - Hardy shrub roses with stout, upright stems, solitary rose-purple to white flowers in summer, and attractive, large, orange-red fruits. Favorite cultivars include ‘Blanc Double de Coubert’ , ‘Frau Dagmar Halstrup’ (pictured), and ‘Purple Pavement.

Rosa_rugosa_Frau_Dagmar_Halstrup

19. Common Elderberry (Sambucus canadensis)*- A native 6-10-foot shrub with large, flat clusters of white flowers from late June-August, followed by dark purple-black berries.

Sambucus canadensis at The Morton Arboretem

20. Chaste Tree (Vitex agnus-castus) - An unusual, aromatic, 8-10-foot 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.

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*Native to Illinois

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