If you have allergy offending trees or shrubs in your neighborhood (probably because of a very common case of botanical sexism), one of the best things you can do to protect yourself from the pollen is to plant a tall dense hedge. If placed on the windward side of your property it will reduce your exposure by filtering and blocking pollen particles.
That said, many common hedges are problematic for allergy sufferers. Privet, male yew, male juniper, male willow, mountain laurel, and any type of cypress, olive and arborvitae are all poor choices as they tend to be quite allergenic.
Using the OPALS scale as presented in Thomas Ogren's book, The Allergy Fighting Garden you can find how allergenic a plant is. These shrubs have been chosen for their low (allergy-free) score as well as for their ability to create a dense hedge that can block and filter out pollen dust that often travels in ground currents.
Image - Clockwise from the top: Mahonia 'Lionel Forestcue', Osmanthus burkwoodii, Euonymus elatus 'Compactus', Osmanthus heterophyllus 'Variegatus' and Rhamnus alaternus 'Argenteovariegatus' combine to make a beautiful Autumn Tapestry.
Planting note: If you can't find a plant locally, it may be because it is invasive in your area (and is therefore not carried by local retailers). You can check your local invasive species list here.
5 Options for Allergy Reducing Hedges:
Rhamnus alaternus is a good evergreen shrub with dense dark green glossy foliage throughout the year. The small spring-blooming greenish-yellow flowers produce reddish fruit that ages to a dark purple color. Grows fast (2–3 feet/ year) and will max out at 15-feet-tall. Will tolerate full sun to part shade. Hardy in zones 7-10.
This variety Rhamnus alaternus 'Argentovariegata' has attractive variegated leaves.
Myrica pensylvanica are tough winter hardy, semi-evergreen, native shrubs with an upright habit. They will grow to ten feet and often spread by suckers to form colonies. They are noted for their pretty silver berries in winter, their salt spray tolerance, and their adaptability to urban stresses and wet sites.
Ilex x meserveae var. (female) are generally desirable for their red fruit and they pose no allergenic threat. Many female varieties will not set fruit without the presence of a male plant which is considerably more allergenic (a 7 on the OPAL scale vs. a 1 for
Only one male plant is needed for as many as 7-8 females, so placement can be strategic (perhaps on the backside of a hedge) to reduce allergy potential.
I am partial to the chartreuse color of Ilex x meserveae 'Castle Gold' but there are many other options as well.
Beyond OPALS - 6 Easy and Practical Ways To Reduce Garden Allergens
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All plants in the mallow family are good for allergy sufferers, but the hardy hibiscus, commonly known as Rose of Sharon, is particularly nice for northern climates. These beautiful flowering shrubs come in a variety of colors, can get to 12 feet tall and are very tolerant of pollution, varied light conditions, and poor soil.
This particular one is called Pink Chiffon and it gets quite tall. Other varieties have flowers that range from red to pink and purple and some also have leaf color that can be deep burgundy.
Most bamboo varieties are monocarpic which means they bloom only once in their lives, then they go to seed and die – thus having a very low allergy potential. There are many varieties, but care needs to be taken to make sure they do not become problematic spreaders.
This image is of heavenly bamboo (Nandina domestica) which is a popular (but not very tall) variety. It is more shrubby that other varieties and looks different those that carry the typical Bamboo pole look.