Companion planting is a core element of organic gardening. This has proven to have improved the yield of surrounding plants and even improve the flavour of neighbouring plants.
Who doesn’t like being around a friend? Around someone with similar likes perhaps? Or in whose company we bloom to our fullest or even someone who offsets our own quirks?
Well, as it turns out this may be a natural instinct for all living things, including plants. Maybe we've learnt this behaviour from plants? Watch them grow in the forest and you find they thrive in the company of some and are unable to in the presence of others. It is interesting to understand how this works and use it to the advantage of all plants in your organic garden.
Many of us think of organic gardening as growing without the use of pesticides. While this is a key feature, an organic garden is much more than a mere shift from harmful chemical fertilisers to organic ones. It is in fact an entire interconnected system that includes insects, birds, sun, water and all other aspects of a living community. Viewed through such a lens, companion planting is a core element of organic gardening.
Its benefits are many - natural insect repellents, shade and windbreaks; providing necessary nutrients to the soil and other plants and reducing the need for external fertilisers. Another advantage of companion planting is making optimal use of available space by growing plants of differing heights. By growing different types of plants, the garden becomes a conducive environment for beneficial microbes and insects.
In addition to the science of companion plants having the ability to improve the yield of surrounding plants, some people have also found that companion plants improve the flavour of neighbouring plants; a strong connect with our taste buds! For instance basil planted with tomatoes not only improves the yield – they taste good together!
The planting of the ‘Three Sisters’ (beans, corn and squash) by the Native Americans is often cited as a classic example of companion planting: The beans provide the essential amino acids, riboflavin, and niacin; the squash provides vitamins A and C, and vegetable fat from their seeds; and the corn provides all the other nutrients needed.
It is said that each of the ‘Three Sisters’ when grown together provided a harvest that would keep and sustain the community for months. In terms of space, the tall, sun-loving corn proved to be the perfect companion to shade tolerant squash and the creeper beans used the corn as a trellis. This diverse canopy also helped in pest control to a fair extent. What also worked was that these vegetables tasted good together, when cooked!
When selecting companion plants for the garden, not only should we consider which pests are deterred but also what each plant adds or takes away from the soil, and what effect the proximity of strong herbs may have on the flavour of neighbouring vegetables!
Some underlying techniques of companion planting include:
Some examples of companion planting in your vegetable garden
Beans: All beans enrich the soil with nitrogen fixed from the air. Generally, they are good company for carrot, celery, corn, eggplant, peas, potato, beets, radish, and cucumber. Beans are great for heavy nitrogen users like corn because beans fix nitrogen from the air into the soil so the nitrogen used up by the corn are replaced at the end of the season when the bean plants die. Keep beans away from the alliums (flowers).
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