Low Allergy Gardening

There is increasing evidence that asthma and hay fever may be linked to food sensitivity but while the investigations are done suffers still need to avoid inhaled allergens. Alistair Rivers explains how to reduce risk of triggering an attack in your garden.

 

Gernaiums

Asthma is the most common chronic disease in the world. In southeast England one in every in adults is affected; nationally, a child suffering an acute asthma attack is admitted to hospital every nine minutes. For the three million asthma suffers in the UK merely stepping into their own garden in summer can trigger a severe asthma attack.

Worse still ‘hayfever’ is not confined to  spring or summer. Symptoms can occur at any time of the year triggered not simply by pollen but by anything from scents to saps, fungi spores to dust. However with a little care it is possible to create a ‘safe’ and colourful garden, which will minimise the risk of triggering an attack. In creating your garden you need to be aware of the gardens around. Clearly you cannot influence what is happening elsewhere but to use the analogy of a nuclear bomb, it is the difference between being at ground zero and some distance away where the effects have begun to disperse.

Use living filters to remove the dust: a deciduous hedge or climbing plants on a trellis. Dust is always the biggest problem so choose plants with sticky leaves which trap pollen and dust and can then be disposed of safely when their work is done.

FuschiaIn your own garden you need to eliminate those plants which contain the most potent triggers. This means selecting plants with sterile flowers or ones which produce heavy pollen not easily blown by the wind. You must reject all wind pollinated plants such as British native trees and plants which produce large quantities of light pollen, like daisy flowers.

Also remember to avoid plants with spines and milky sap which may cause skin reactions. Luckily fruit trees and bushes that do not have spines can be used, so strawberries are’ in’ but rhubarb is ‘out’ because of its poisonous leaves. Care must be taken when picking herbs as in hot weather the essential oils can cause reactions
    
In most gardens space is at a premium and so many plants need to be dual purpose; all plants need to cover more than two criteria such as interesting foliage and flower. That will give design more flexibility and help keep plant numbers manageable.

To minimise the manual tasks associated with gardening and, to suppress weeds which may also spark off an allergic reaction use plenty of  ground cover plants but avoid mulches of organic matter as  they will add to the fungal spores in the air in the autumn.

A major source of allergic  reactions is turf sap. Most people assume that grass pollen is the trigger for hay fever, but garden lawns rarely flower. It is this sap thrown up by the mower that causes eyes to water and nose to run. A cylinder mower will minimise the sap in the air.
Alternatively replace the grass with a hard easy-to-maintain surface.

To me the Low Allergen Garden is not an end in itself but an example to asthma sufferers of what can be achieved with a little cunning and some readily available plants.

Low allergen planting list   

TREES  
Cataplana bignoniodes aurea Large leaves with good yellow reflective colour
Malus hupenhensis Heavy pollen, autumn fruit
SHRUBS  
Aucuba japonica Thick leaves, smooth and long lived, evergreen
Cornus alba Spaethii Deciduous, good winter colour, sterile flowers
Cotinus coggyria Royal Purple, deciduous, good autumn colour, sterile flowers
Escallonia cultivars Sticky leaves, little pollen
Fuschia cultivars Sticky pollen, deciduous, cut back to reduce dust
Hydrangea cultivars Hortensis cvs, deciduous, sterile flowers
Viburnum opulus Deciuous, sterile flowers
Viburnum Tinus Flowers in winter, little pollen, evergreen sticky leaves
Weigela florida Deciduous, little pollen
Phormium tenax Good foliage, doesn't trap dust, some sterile flowers
Phormium Cream Delight Sterile flowers in the UK
Rose free as air Charity rose for NAC
CLIMBING PLANTS  
Ampelopsis vietchii Deciduous, sterile flowers
Clematis cvs Some sterile flowers, deciduous, good dust filters
Hydrangea petiolaris Deciduous, sterile flowers
Passiflora cvs Some sterile flowers, deciduous, fertile flowers set little pollen
GROUND COVER PLANTS  
Ajuga reptans Good cover, little pollen
Bergenia cvs Evergreen, sterile flowers or little pollen
Geranium cvs Deciduous, little or no pollen
Hosta cvs Heavy pollen, deciduous, no scent
Lamium cvs Godo cover of soil, little pollen
Lysmachia nummualria Good cover of soil, no flowers
Vinca minor Heavy pollen, sterile evergreen leaves
HERBACEOUS PLANTS  
Campanula cvs Deciduous, little or no pollen, no scent
Geum cvs Little or no pollen, no scent
Paeonia cvs Sterile flowers, no scent
Polemonium cvs Sterile or little pollen from flowers
Veronica gentianoides Little pollen, no scent

First published in the FoodsMatter magazine 1999; revised for the FoodsMatter site 2014


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