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Best Plants for Problem Clay Soils: Shrubs


Shrubs

Aesculus pavia — Red buckeye
Hummingbirds are attracted to the long clusters of red to orange-red flowers of red buckeye. It has palmately compound leaves and seed capsules with 1 or 2 shiny brown buckeyes. Red buckeye grows in full sun to part shade, although it may become more open in shade. This shrub is suitable for the shrub border in groups, massed or as a specimen plant, keeping in mind that it may lose its leaves in early fall.

Callicarpa americana — Beautyberry
The delicate lavender to pink flowers of beautyberry mature into profuse bright violet to magenta fruits that encircle the nodes of the stems in thick rings. In the St. Louis area, this loose, open shrub will probably die back to the ground in winter and should he grown as an herbaceous perennial. Best when massed at the back of shrub borders, in native plant gardens, or naturalized, beautyberry requires minimal care once established.

Clethra alnifolia — Sweet pepperbush
Summersweet or sweet pepperbush has upright clusters of fragrant white flowers and lustrous dark green leaves that turn pale yellow to golden brown in fall. Its dried seedpods are an interesting addition to the winter garden. Cultivars with pinkish white to rosy flowers or variegated leaves are available.

Cornus sericea — Red osier dogwood
The intensely red stems of red osier dogwood are a striking garden feature in fall and winter. Its clusters of small white flowers mature into whitish fruits that attract birds. Best when grown in mass, this vigorous shrub will spread by underground stems.

Corylus americana — Hazelnut
American filbert or hazelnut is a multi-stemmed shrub that is best grown in informal areas where it can spread, as a hedge, or at the rear of a shrub border. The 3 to 4" long yellowish brown male catkins are showy in early spring. Its edible nuts are enclosed in interesting leafy ragged-edged bracts and are attractive to squirrels and birds.

Hamamelis vernalis
— Ozark witch hazel
The fragrant and unusual flowers of Ozark witch hazel are a welcome addition to the garden in mid to late winter. These flowers are generally yellow to red with 4 narrow twisted petals and bloom for up to a month. Changing to a golden yellow in fall, this durable plant is good for shrub borders, screens or informal hedges, a specimen plant or a native plant or naturalized garden.

Ilex verticillata — Winterberry
Winterherries are known for their red berries that brighten the garden in fall and winter. Berries are only borne on female plants, but generally just one male plant is needed for every nine to ten female plants. This shrub is a good choice for low wet areas and is especially attractive when grown massed or in groups.

Rhus aromatica — Fragrant sumac
Despite its relationship and resemblance to poison ivy, fragrant sumac is non-poisonous and is an easily grown shrub that can provide a cover for embankments, difficult areas with poor soil, native plant gardens or naturalized areas. Female flowers mature into clusters of hairy red fruits that are attractive to wildlife and may persist into winter. The glossy trifoliate leaves are aromatic when bruised and turn orange, red, and purple in fall. 'Gro-low' is a popular cultivar that may reach 2' tall and 6-8' wide, making it a good choice for a low hedge or ground cover.

Symphoricarpos orbiculatus — Coralberry
Coralberry or Indian currant is valued for its showy coral red fruits that persist through most of the winter attracting birds and wildlife. The stems may also be used in indoor floral arrangements. The nectar of the tiny flowers provides food for bees and hummingbirds while the leaves are a food source for butterfly larvae. Spreading by root suckers and runners, coralberry is a good choice for a hedge, naturalizing, native plant gardens, or shrub borders.

Viburnum dentatum — Arrowwood viburnum
Arrowood viburnum is a durable vigorous shrub used for hedges. screens, shrub borders and native plantings. Its white flat-topped flower clusters mature into blue to bluish-black fruits that attract birds and wildlife. The lustrous dark green leaves of this multi-stemmed shrub with its straight-as-an-arrow branches change to drab yellow to glossy red and reddish purple in fall.


Sun: F=Full sun, P=Part shade, S=Shade; Water: D=Dry, A=Average, W=Wet

Scientific name

Common name

Height (ft)

MO
native

Zone

Bloom color

Bloom time

Sun

Water

Notes

Aesculus pavia

Red buckeye

12-15

Yes

4-8

Red

Mid to late spring

F-P

A

Flowers attract hummingbirds; easily grown from seed; good for shrub border

Aronia arbutifolia

Red chokeberry

6-10

No

5-9

White

Late spring

F-P

A

Good fall color; most effective when grown in a group; tolerates boggy soil

Berberis thunbergii

Japanese barberry

3-6

No

4-10

Yellow with red tinge

Mid spring

F-P

D-A

Many cultivars are available for a wide variety of foliage; tolerates dry conditions

Buddleja davidii

Butterfly bush

4-10

No

5-9

Lilac

Early summer to frost

F

A

Grows taller in warmer climates; usually grows as herbaceous perennial in Zones 5 and 6

Callicarpa americana

Beautyberry

3-6

Yes

6-10

Lavender, pink

Summer

F-P

A

Grow as herbaceous perennial; blooms on new growth; fruits more profusely in full sun

Calycanthus floridus

Carolina allspice

6-10

No

4-9

Brown

Mid to late spring

F-P

A

Fragrant flowers (scent varies); good specimen tree or in shrub border

Chaenomeles speciosa

Flowering quince

6-10

No

5-8

Crimson

Spring

F-P

A

Tolerates wind and drought; valued for profuse flowers

Clethra alnifolia

Summersweet

3-8

No

3-9

White

Mid to late summer

F-P

A

Fragrant flowers; good for wet areas

Cornus sericea

Red osier dogwood

7-9

No

3-8

White

Late spring to early summer

F-P

A

Red stems provide winter interest; fast grower; good for wet areas

Corylus americana

Hazelnut

10-16

Yes

4-9

Male-brown, female-red

Spring

F-P

A

Will spread to form thickets; produces edible nuts

Cotinus coggygria

Smoke tree

10-15

No

5-8

Yellow

Mid to late spring

F

A

Not for poorly drained clay; valued for long-lasting display of smoke-like hairs on spent flowers

Deutzia gracilis

Slender deutzia

2-5

No

5-8

White

Spring

F-P

A

 Flowers best in full sun; prune in spring after flowering

Euonymus alatus

Winged euonymus

15-20

No

4-8

Yellow-green

Late spring

F-P

A

Good fall color; tolerates full shade; not for wet soil

Forsythia x intermedia

Early forsythia

8-10

No

6-9

Yellow

Early to mid spring

F-P

A

 Flower buds may be killed in Zone 5; flowers more in full sun

Hamamelis vernalis

Ozark witch hazel

6-10

Yes

4-8

Yellow with red inner calyx

Mid winter to early spring

F-P

A

 Fragrant flowers; leaves turn golden yellow in fall

Hibiscus syriacus

Rose of Sharon

8-12

No

5-8

Dark pink, white, red, purple

Mid summer to early fall

F-P

A

 Not for extremely dry or extremely wet soil; does well in hot weather

Hydrangea arborescens

Smooth hydrangea

3-5

Yes

3-9

White

Summer

P

A

 Grow as herbaceous perennial to offset weedy appearance, especially in cold winter climates; does not tolerate drought

Hydrangea paniculata

Hydrangea

10-25

No

3-8

White, aging to pink

Late summer

F-P

A

 One of the most cold hardy hydrangeas; best when pruned to 6-10’

Hypericum prolificum

Shrubby
St. John’s wort

1-5

Yes

3-8

Yellow

Early to mid summer

F-P

A

 Tolerates some drought; for shrub border, native plant garden or hedge

Ilex decidua

Possum ham

7-15

Yes

5-9

Dull white

Mid to late spring

F-P

A

 Need male and female plants for fruit; attracts small mammals and birds

Ilex verticillata

Winterberry

6-10

Yes

3-9

White

Mid spring

F-P

A-W

 Need male and female plants for fruit; good for wet places

Itea virginica

Virginia sweetspire

3-5

Yes

5-9

White

Early summer

F-P

A-W

 Good for wet areas; fragrant flowers; leaves attractive red in fall

Kerria japonica

Japanese kerria

3-6

No

4-9

Bright yellow

Mid spring

P

A

 Tolerates full shade; blooms on previous year’s wood; may rebloom in summer

Kolkwitzia amabilis

Beauty bush

 6-10

No

4-8

Pink with yellow throat

Late spring to early summer

F

A

Best flowering in full sun; renew by pruning out old wood or cutting to ground

Lindera benzoin

Spice bush

 6-12

Yes

4-9

Greenish yellow

Early spring

F-P

A

Good for moist areas; fragrant leaves; tolerates full shade

Lonicera fragrantissima

Winter honeysuckle

 6-10

No

4-8

Creamy white

Early spring

F-P

D-A

Very fragrant flowers; for hedge, screen or background plant

Magnolia Little Girl series

Magnolia

 10-15

No

4-7

Purple to red purple, some fading to white or pink inside

Early spring

F-P

A

Includes cultivars such as ‘Ann,’ ‘Betty’ and ‘Jane’; bred to avoid frost damage by blooming later

Malus sargentii

Sargent crabapple

 6-8

No

4-7

Pale pink buds, white flowers

Spring

F

A

Fruits attract birds; generally blooms profusely in alternate years

Philadelphus coronarius

Sweet mock orange

 10-12

No

4-8

Creamy white

Late spring to early summer

F-P

A

Thrives in dry conditions; fragrant

Physocarpus opulifolius

Ninebark

 5-8

Yes

2-8

White, pink

Late spring

F-P

D-A

Bark exfoliates to provide winter interest; cut to ground in winter to rejuvenate

Potentilla fruticosa

Shrubby cinquefoil

 1-4

No

2-7

Yellow

Early summer to frost

F-P

A

Tolerates poor dry soil; flowers best in full sun

Pyracantha coccinea

Scarlet firethorn

 6-18

No

6-9

Whitish

Late spring to early summer

F-P

A

Does well in dry soil during summer; prune anytime to control growth

Rhodotypos scandens

Black jetbead

 3-6

No

4-8

White

Late spring to early summer

F-P

A

Tough plant for difficult areas; jet black berries persist throughout winter

Rhus aromatica

Fragrant sumac

 2-6

Yes

3-9

Yellow

Early spring

F-P

D-A

Full sun gives better fall color; not for poorly drained soil

Ribes odoratum

Clove currant

 6-12

Yes

4-8

Yellow

Spring

F-P

A

Spreads by suckers to form colonies; fragrant flowers

Rosa rugosa

Rugosa rose

 3-8

No

2-9

Purplish rose to violet carmine

Summer

F

A

Large bright red hips attract birds; fragrant flowers

Salix purpurea

Purpleosier willow

 8-10

No

3-6

Grayish white

Early spring

F

A-W

Has purple stems that turn light to olive gray; good for wet areas

Sambucus canadensis

Common elderberry

 5-12

Yes

3-9

White

Summer

F-P

A-W

Fruit attracts birds and is used for wines and jellies; may look unkempt in small gardens

Spiraea japonica

Japanese spirea

 4-6

No

3-8

Pink

Late spring to mid summer

F

A

Cultivars more readily available than species; attracts butterflies

Spiraea nipponica ‘Snowmound’

Spirea

 2-4

No

3-8

White

Late spring

F-P

A

Flowers profusely; attracts butterflies; for hedges, foundation plant or borders

Staphylea trifolia

American bladdernut

 10-15

Yes

3-8

White

Spring

P-S

D-A

Prefers moist soil; seed capsules are interesting addition to dried arrangements

Symphoricarpos orbiculatus

Coralberry

 2-5

Yes

2-7

Pinkish white

Summer

F-P

A

Spreads by suckers and runners; showy fruits provide winter interest or may be used in floral arrangements

Syringa vulgaris

Common lilac

 8-15

No

3-7

Lilac

Spring

F

A

Needs good air circulation to reduce
disease: best flowering in full sun but tolerates part shade

Viburnum dentatum

Arrowwood Viburnum

 6-10

Yes

2-8

White

Late spring

F-P

A

Vigorous reliable plant; fruit attracts birds and wildlife

Viburnum prunifolium

Black haw

12-15

Yes

3-9

White

Spring

F-P

D-A

May also be grown as small tree; fruits attracks birds and wildlife; tolerates drought

Weigela florida

Old-fashioned weigela

6-9

No

4-8

Rosy pink

Spring

F

A

May rebloom during summer

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