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April 13, 2012

Indoor Plants – Pest Management & Pollution Control

by Val Reynolds
Scented orchid

Scented orchid

Indoor pest management includes a careful inspection before purchase and when bringing plants in from the garden. Meeting a plant’s environmental needs reduces plant stress and a healthy plant is less vulnerable to attack.

When pest control is necessary non-toxic or less toxic insecticides can offer effective control. Natural pyrethrum spray is relatively safe, synthetic pyrethrum is less desirable. A 0.2 per cent solution of mild washing-up liquid is generally an effective method of washing plant leaves. Cotton buds dipped in surgical spirit is a good way to remove spider mites, mealybugs, scale insects and aphids, although I found scale insects needed this treatment for far longer than I imagined. The only effective method I found was to lever them off with a flat ended knife.

Making your own non-toxic spray: Mix 2 teaspoons (10 ml) vegetable oil, 1/8 teaspoon (0.6 ml) washing-up liquid, 8 fl oz (230 ml) warm tap water is quite rewarding. Shake vigorously.

Not all my plants are strictly houseplants, I raise a lot of fuschias from cuttings. These are wholeheartedly targetted by whitefly so I have an ongoing fight! Now I keep them outside for the birds to take their share right up to the last possible day before frost might wipe them out.

My absolute favourite indoor plant book was written by Wolverton – Eco-Friendly House Plants: How to grow and nurture 50 houseplants to ensure you have clean, non-polluted air in your home and office. Wolverton undertook some pioneering research on clean air in space stations by the US Space Agency. You can read more about his work here.

Of the houseplants that fall into the category of eco friendly according to Wolverton a rubber plant is the most likely to be successful. Bred for toughness, it will survive in less light than most plants its size. It has a high resistance to insect infestation and is easy to grow and, very important, is especially effective at removing formaldehyde most often found in furnishings that take years to cease emitting fumes.

Weeping fig in conservatory

Weeping fig in conservatory

A ficus longifolio alii commonly known as the weeping fig, has proved to be exceptionally hardy in our conservatory. It is sited partially in the sitting room and has tolerated neglect over the past 15 years. Apparently it does like misting – now becoming a bit difficult in view of its size – almost 10 feet high. I spread polythene around and use the step ladder! It is good at removing a range of chemical vapours, is easy to grow and maintain.

Christmas and Easter cactus have the unusual property of removing carbon dioxide and releasing oxygen at night – the opposite of most plants – which makes them suitable for bedrooms. These plants often become quite large and survive for many years. Easy to propagate from cuttings and very resistant to insect infestation they make a great gift for friends.

Source: Eco-Friendly House Plants by B C Wolverton How to grow and nurture 50 houseplants to ensure you have clean, non-polluted air in your home and office.

THIS IS THE ONE BOOK I WOULD NEVER EVER BE WITHOUT! and when my copy lent to a friend wasn’t returned I looked on Amazon and found a used copy at £2.01+£2.80 pp.

It has been recently updated as How Grow Fresh Air

Val Reynolds, Editor

Photography Pintail Photo

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