7 Low-Allergen Flowering Shrubs Perfect for Allergy-Sensitive Gardeners

Key Points

Seasonal allergies are primarily caused by trees and grasses, whose tiny pollen particles travel on the wind.

Low-allergen flowering shrubs can add low-maintenance color and interest to gardens.

Plants with colorful or fragrant blooms attract insects for pollination, and are less likely to affect allergies.

Summer flowers add a welcome pop of color to your garden, but this time of year can also bring on seasonal allergies. Luckily, plants that cause allergies tend to be trees and grasses, whose tiny grains of pollen are spread via wind, rather than ornamental flowers and garden vegetables that are pollinated by insects.

However, if you’re looking for low-allergen flowering shrubs to add to your yard, there are several attractive perennial options. Here are seven flowering shrubs for allergy-sensitive gardeners to consider.

Bougainvillea

Credit: Jenny Dettrick / Getty Images

For pollen-sensitive gardeners in warm climates, vivid bougainvillea is a go-to statement plant. It’s ideal for dry climates with watering restrictions because it’s drought tolerant once established, making this a low-maintenance, low-allergen plant.

Those in temperate regions can keep it in a pot that’s brought indoors for winter. Keep in mind that bougainvillea has thorns, however, so you’ll want to put it someplace out of the way, especially with children around. Tuck it into a corner of your yard or plant it against a fence to add some support.

Botanical name: Bougainvillea

USDA hardiness zone: 9-11

Bloom period: Spring, summer, or fall, depending on climate

Flower color(s): Purple, pink, red, orange, white, yellow

Hollyhock

Credit: The Spruce / Evgeniya Vlasova

Another low-allergen flowering shrub that comes in a rainbow of colors is the hollyhock, whose tall spires of showy flowers can grow up to eight feet tall.

Plant these sizable shrubs in a spot with full sun and well-drained soil for the best blooms; they do well as a back border plant or sited along a fenceline. Water the soil at the base of the plant directly to keep its foliage dry and reduce the spread of plant pathogens.

Botanical name: Alcea spp.

USDA hardiness zone: 2-10

Flower color(s): White, pink, red, yellow, purple, orange

Adam’s Needle

Credit: maksim-yakovlev / Getty Images

Yuccas like Adam’s needle are known for their hardy, spiky evergreen foliage, but even these unshowy succulents can wow with the tall flower spikes they grow in summer once plants are about five years old.

In addition to being low-allergen, Adam’s needle is extremely low maintenance, requiring very little care after planting. After blooming, allow the flower stalks to die off naturally before cutting them back in late fall.

Botanical name: Yucca filamentosa

USDA hardiness zone: 4-10a

Smoke Bush

Credit: The Spruce / Letícia Almeida

Smoke bush stands out in any yard or garden—and won’t inflame seasonal allergies with its pollen. Cloud-like clusters of tiny pink flowers pop against green or deep burgundy foliage, depending on the variety.

Because this shrub can grow quite large, you’ll want to give it plenty of space; plan for a mature size of up to 15 feet tall and wide. Once established, smoke bush is drought resistant, but give it plenty of water in its first season.

Botanical name: Cotinus coggygria

Bloom period: Spring, summer

Flower color(s): Pink, purple

Mandevilla

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Like bougainvillea, mandevilla is a popular in-ground perennial vine in subtropical regions but can be kept as an annual in pots during hot, humid summers in cooler climates.

It’s also a low-allergen shrub with bright, colorful flowers that can brighten any porch, patio, or backyard landscape. Give this plant full to part sun, well-drained soil, and regular water to enjoy its profuse blooms all season long.

Botanical name: Mandevilla spp.

USDA hardiness zone: 10-11

Bloom period: Summer, fall

Flower color(s): Pink, red, white

Beautyberry

Credit: The Spruce / Adrienne Legault

Beautyberry is a unique native shrub that delivers a one-two punch of subtle spring and summer flowers followed by the real star: clusters of vivid purple, pink, or white berries that appear along its gently arcing stems in late summer and last through fall. This low-allergen flowering shrub also provides a food source for birds and other wildlife, and its berries can even be made into an edible jelly.

Botanical name: Callicarpa americana

USDA hardiness zone: 6-10

Bloom period: Spring, summer

Flower color(s): Pink, purple, white

Anise Hyssop

Credit: The Spruce / Evgeniya Vlasova

Another lower-allergenic flowering shrub that provides color from spring through fall is anise hyssop, also known as giant hyssop. Native bees and other pollinators love it, and both the leaves and flowers can be used in teas, salads, and other food for humans. For gardeners, spires of tiny purple flowers growing on tall, lush green stems appear in late spring and last through fall.

Botanical name: Agastache foeniculum

Bloom period: Summer, fall

Flower color(s): Purple, blue

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