Combining and mixing crops has the effect of reducing damage from pests and diseases. Marigolds are particularly useful and should be present in every vegetable garden. They are most effective when planted alongside pathways. When you brush up against them they release a pungent, pest-confusing smell. Similarly, some annual herbs such as chervil, dill and summer savoury are beneficial when grown amongst crops as their strong scent hides the plants from pests. The scents of rosemary, thyme, sage, chives, hyssop and lavender are effective pest deterrents and their flowers attract predators and pollinators. These herbs should be confined to the edges of vegetable plots. Garlic and chives are often grown under roses to prevent fungal and bacterial attacks. Some plants, such as the Nicotiana Sylvestris, are grown as sacrificials to attract pests away from the main planting. Also referred to as trap plants, these have sticky…

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