Plants can also repel pests or disease through the production and release of chemicals or odours. Chives, for example, repel aphids. If you plant them near your roses, therefore, they can bestow this protection on these blooms.
Consideration of these factors in planning your garden will help you to create a healthy, thriving garden. Your plants will enhance the growth of their neighbours instead of competing with them.
Many plants have natural substances that repel or attract insects depending on your needs. In some situations they can also help enhance the growth rate and flavour of plants situated in close proximity. Companion planting helps bring a balanced eco-system to your garden, allowing nature to do its job. By using companion planting, many gardeners find that they can discourage harmful pests without losing beneficial allies. There are many varieties of herbs and flowers that can be used for companion plants, which combines both beauty and purpose to give you an enjoyable, healthy garden.
Companion planting Guide
BASIL • Plant with tomatoes to improve growth and flavour. Repels flies and mosquitoes.
BAY LEAF • Place a fresh bay leaf in storage containers of beans or grains to deter weevils and moths.
BEANS • All beans enrich the soil with nitrogen. In general they are good company for carrots.
BORAGE • Plant with tomatoes and strawberries. One of the best bee-attracting plants. Also adds trace minerals to the soil and is a good addition to the compost heap. Borage may benefit any plant it is growing next to by increasing resistance to pests and disease.
CATNIP • Deters flea beetles, aphids, ants and weevils.
CHAMOMILE • The German variety improves the flavour of cabbages, cucumbers and onions. Accumulates calcium, potassium and sulphur, later returning them to the soil. German chamomile will reseed itself.
CHERVIL • Aids in repelling aphids from lettuce.
CHIVES • Improves growth and flavour of carrots and tomatoes.
COMFREY • Accumulates calcium, phosphorous and potassium. Likes a moist position in the garden.
CORIANDER • Repels aphids, spider mites and potato beetle. A good partner when planted with anise.
DILL • Improves growth of cabbage and lettuce, but do not plant near carrots or tomatoes. Also goes well with onions and cucumbers.
GARLIC • Plant close to roses to repel aphids. Builds up sulphur, which is a naturally occurring fungicide that will help in the garden with disease prevention.
HYSSOP • Companion plant for cabbage and grapes. Hyssop may be the number one preference for bees - some beekeepers rub the hive with it to encourage the bees to keep to their home.
LAVENDER • Everyone should have at least one lavender plant in their garden. Prolific flowering lavender nourishes many nectar feeding and beneficial insects. Use dried sprigs of lavender to repel moths.
LEMON BALM • Sprinkle throughout the garden in dried powder form to deter many bugs. Lemon balm has citronella compounds - crush and rub the leaves on your skin to keep mosquitoes away!
MARIGOLDS (Calendula) • Given a lot of credit as a pest deterrent and supposed to discourage many insects. Plant freely throughout the garden. The marigolds you choose must be of the scented variety.
MARJORAM (Sweet) • As a companion plant it improves the flavour of vegetables and herbs.
MINT • Deters white cabbage moths, ants, rodents, beetles, fleas, aphids and improves the health of cabbage and tomatoes. Earthworms are quite attracted to mint plantings. Be careful where you plant it as mint can be incredibly invasive.
NASTURTIUMS • Plant as a barrier around tomatoes, cabbage, cucumbers, and under fruit trees. Deters aphids, whiteflies and other pests.
PARSLEY • Plant among and sprinkle on tomatoes and asparagus. Parsley increases the fragrance of roses when planted around their base.
PEPPERMINT • Bees love it, aphids and other pests hate it.
PETUNIAS • Repel certain aphids and general garden pests. A good companion to tomatoes.
ROSEMARY • Great for planting around the garden. Use as a companion plant to cabbage, beans, carrots and sage.