11 Shrubs That Produce Clusters Of Flowers

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Flower clusters are a grouping of small flowers producing an abundance of flowers that will attract any pollinator.

They can be used in any garden or landscaping setting such as hedges, stand-alone, edging, a focal point for a flower garden, or almost any other setting.

1. CRAPE MYRTLE

Large Crape Myrtle

Crape myrtles are deciduous shrubs with about 50 different varieties that range from ground-cover plants to tall and wide shrubs.

They are known for their large clusters of flowers, their ability to bend with the wind without breaking, and their fall foliage.

  • Shrub size – grows to about 30 feet tall and 20 feet wide depending on the variety
  • U.S.D.A. hardiness zone – 7 through 10
  • Soil pH – 6.0 through 6.5
  • Drought tolerant – yes
  • Sun exposure – full sun
  • Blooming colors – red, purple, pink, and white
  • Flower cluster size – up to 2 inches wide
  • Deadheading – yes
  • Blooms attract – bees and butterflies
  • Deer resistant – yes
  • Also known as –
  • Pests – aphids, Japanese beetles, and scale
  • Diseases – powdery mildew, sooty mold, and Cercospora leaf spot

2. HYDRANGEA

Multi-colored hydrangea

Hydrangeas are evergreen shrubs that are native to Asia, North, Central, and South America with over 75 species.

The color of their flower can be changed with the manipulation of the pH of the soil and aluminum sulfate for a more blue color and garden lime for pink color.

  • Shrub size – grows to about 15 feet tall and 12 feet wide depending on the variety
  • U.S.D.A. hardiness zone – 3 through 9
  • Soil pH – 6.0 through 6.2
  • Drought tolerant – yes
  • Sun exposure – partial shade but some can tolerate full sun
  • Blooming colors – blue, purple, pink, red, and white with a variety of blooming shapes and sizes that appear in early spring into late fall
  • Flower cluster size – up to 10 inches wide
  • Deadheading – yes
  • Blooms attract – bees and butterflies
  • Deer resistant – no
  • Also known as – hortensia
  • Pests – aphids, slugs, Japanese beetle, rose chafers beetle
  • Diseases – botrytis blight, leaf spot, anthracnose, powdery mildew, rust, bacterial wilt, and bacterial leaf spot
  • Viruses – hydrangea ringspot virus, hydrangea mosaic virus, and tomato ringspot virus

3. BUDDLEIA

Buddleia

Also known as butterfly bush that is native to Central China and has evolved over time into more than 140 species.

It is a highly invasive plant that produces over 100,000 seeds per plant and the seed are spread by the wind.

Because this plant is so invasive, it is highly recommended to deadhead the blooms, meaning removing the blooms from the plant.

Deadheading flowers will also cause the plant to rebloom allowing for season-long flowers throughout your garden or landscaping.

  • Shrub size – grows to about 15 feet tall and 10 feet wide depending on the variety
  • U.S.D.A hardiness zone – 5 through 9
  • Soil pH – 5.5 through 7.0 with some being able to grow with a pH level up to 8.5
  • Drought tolerant – yes
  • Sun exposure – full sun
  • Blooming colors – purple, pink, orange, blue, and white that appear in mid-summer to early fall
  • Flower cluster size – up to 4 inches wide and 1 foot long
  • Deadheading – yes
  • Blooms attract – butterflies, hummingbirds, and bees
  • Deer resistant – yes
  • Pests – spider mites and aphids
  • Diseases – downy mildew, phytophthora, and Rhizoctonia
  • Also known as – summer lilac

4. SPIREA

Spirea

Spirea is native to North America and Asia with about 100 species of low-maintenance shrubs.

They produce medium-sized clusters of flowers in abundance.

  • Shrub size – grows to about 4 feet tall and 4 feet wide depending on the variety
  • U.S.D.A hardiness zone – 3 through 8 with some being able to withstand zone 9
  • Soil pH – 6.0 through 7.0
  • Drought tolerant – yes
  • Sun exposure – fun sun
  • Blooming colors – clusters of red, pink, purple, or white that appear from June to August
  • Flower cluster size – up to 3 inches wide depending on the variety
  • Deadheading – yes
  • Blooms attract – hummingbirds
  • Foliage – yellow and orange
  • Deer resistant – yes
  • Pests – aphids, leafrollers, and nematodes
  • Diseases – powdery mildew, fire blight, and leaf spot
  • Also known as – meadowsweet and steeplebushes

5. ASTILBE

Astilbe

Astilbe is a perennial shrub that is native to North America and Asia where they grow in wooded areas with 18 different varieties that include hybrid varieties.

They produce clusters of flowers that form on a long stem making for interesting plume-like blooms.

The type of flowers they produce is known as inflorescence meaning a cluster or group of flowers that are positioned on a stem that is from one of the main stems or from a branch.

  • Shrub size – grows to about 2 feet tall and 2 feet wide depending on the variety
  • U.S.D.A hardiness zone – 3 through 9
  • Soil pH – 6.0
  • Drought tolerant – no
  • Blooming colors – purple, pink, red, and white with 2-foot tall flower spikes that appear in spring and last into the summer with feathery-like blooms
  • Flower cluster size – up to 3 feet tall depending on the varieties
  • Deadheading – no
  • Blooms attract – bees, butterflies, and moths
  • Foliage – thin long green leaves
  • Deer resistant – yes
  • Pests – Japanese beetle, whiteflies, and root-knot nematodes
  • Disease – powdery mildew, leaf spot, and leaf scorch

6. ELDERBERRY

Elderberry

Elderberries are deciduous shrubs that are native to North and South America, Europe, Asia, and the South Pacific islands.

When their flowers are pollinated they produce their popular eatable fruit.

  • Shrub size – grows to about 12 feet tall and 10 feet wide depending on the variety
  • U.S.D.A hardiness zone – 3 through 7
  • Soil pH – 5.5 through 6.5
  • Drought tolerant – yes
  • Blooming colors – light pink, white and yellowish-white color
  • Berry color – yellow, red, blue-black, and black
  • Flower cluster size – up to 2 inches wide depending on the variety
  • Blooms attract – bees and butterflies
  • Foliage – oval-shaped green leaves with jagged edges
  • Deer resistant – yes
  • Pests –
  • Disease –

7. VIBURNUM

Viburnum

Viburnum is native to the Americas, Europe, the Atlas Mountains in Africa, and North Asia with about 175 species.

  • Shrub size – grows to about 20 feet tall and 10 feet wide depending on the variety
  • U.S.D.A hardiness zone – 2 through 9
  • Pruning – heavy pruning should be done in the winter, but light pruning can be done to keep the shape of the shrub
  • Soil pH – 5.5 through 8.0
  • Drought tolerant – not all varieties
  • Blooming colors – pinkish-white and white blooms that appear in spring with a large cluster of blooms
  • Flower cluster size – up to 4 inches across
  • Blooms attract – bees and butterflies
  • Foliage – broad green leaves
  • Deer resistant – yes
  • Pests – aphids, caterpillars. Japanese beetles, weevils, and scale
  • Disease – powdery mildew and leaf spot

8. DEUTZIA

Deutzia

Deutzias are deciduous low-growing and low-maintenance shrubs that are native to Japan.

  • Shrub size – grows to about 2 to 3 feet tall and 5 to 6 feet wide depending on the variety
  • U.S.D.A hardiness zone – 5 through 8
  • Soil pH – 6.0 through 8.0
  • Drought tolerant – yes when established
  • Blooming colors – pink and white
  • Flower cluster size – up to 6 inches across
  • Blooms attract – bees, butterflies, and hummingbirds
  • Foliage – long spade-shaped green leaves with jagged edges
  • Deer resistant – yes
  • Pests – aphids, spider mites, scale, mealybugs, and leaf miners
  • Disease – known to not have any issues with plant diseases
  • Also known as – Nikko

9. NINEBARK

Ninebark is a deciduous low-maintenance shrub that is native to North America with 8 varieties.

They have an exfoliating bark that peels back in layers as the branches get older making for an interesting look in the winter after the leaves have fallen.

  • Shrub size – grows to about 3 to 10 feet tall and 3 to 8 feet wide depending on the variety
  • U.S.D.A hardiness zone – 2 through 8
  • Soil pH – 4.5 through 7.0
  • Drought tolerant – yes
  • Blooming colors – pink and white
  • Flower cluster size – up to 3 inches across
  • Deadheading – yes
  • Blooms attract – bees and butterflies
  • Foliage – large ovate dark purple or green leaves with a lobe on both sides of the leaf. Their leave turn yellow in the fall
  • Deer resistant – yes
  • Pests – aphids
  • Disease – powdery mildew, fireblight, and leaf spot

10. LILAC

Lilac

Lilacs are deciduous low-maintenance shrubs with 2 varieties being native to Europe and 18 varieties native to Asia.

The root system of lilacs is known to spread about one and a half time wider than the width of the shrub.

Therefore you should plant them with a little care if you want them near your home, sidewalks, and other plants.

  • Plant size – grows to about 15 feet tall and 12 feet wide depending on the variety
  • U.S.D.A hardiness zone – 3 through 8
  • Soil pH – 6.0 through 7.0
  • Drought tolerant – yes
  • Blooming colors – blue, red, purple
  • Flower cluster size – up to
  • Deadheading – yes
  • Blooms attract – butterflies and hummingbirds
  • Foliage – spade-shaped green leaves
  • Deer resistant – yes, unless there is no other food source for them
  • Pests – weevils, aphids, lilac borer, and during winter mice and voles may eat the bark which can kill the plant
  • Disease – powdery mildew, ascochyta blight, bacterial blight, shoot blight, and witches’ broom

11. BUTTONBUSH

Buttonbush

Buttonbushes are deciduous, fast-growing, and low-maintenance shrubs that are native to North and Central America as well as Cuba.

  • Shrub size – grows to about 5 to 12 feet tall and 10 to 12 feet wide depending on the variety
  • U.S.D.A hardiness zone – 5 through 11
  • Soil pH – 6.5 through 7.5
  • Drought tolerant – no
  • Blooming colors – pale pink and white
  • Flower cluster size – up to 1 and a half inches across
  • Deadheading – yes
  • Blooms attract – bees, butterflies, and hummingbirds
  • Foliage – long oval-shaped green glossy leaves with smooth edges
  • Deer resistant – yes
  • Pests – thrips, leafhoppers, aphids, Japanese beetles, leaf beetles, and Lygus bugs
  • Disease – buttonbushes have no notable issues with plant diseases
  • Also known as – honey balls

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