Herbs and flowers play a vital role in companion planting, working hard behind the scenes to protect crops, attract beneficial insects and improve growth and flavour. From strongly scented foliage that deters pests to nectar-rich blooms that encourage pollinators, these plants help create a healthier, more balanced garden ecosystem. Adding the right herbs and flowers alongside your crops can reduce the need for pesticides, boost yields and bring colour, fragrance and wildlife into your growing space.
Artemesia (Wormwood)
Strongly scented foliage deters blackfly from
broad beans and other bean crops. Bright
yellow flowers attract hoverflies, lacewings
and ladybirds, which prey on aphids.
Basil
The pungent basil leaves are a magnet for
whitefly, keeping your precious tomatoes
pest-free. Reported to increase productivity of
aubergines and peppers.
Borage
Its tasty cucumber-flavoured blue flowers are
also great for attracting bees and other pollinating
insects. Plant near strawberries and tomatoes to
increase growth and improve their flavour.
Calendula (Pot Marigold)
Lures aphids away, making it a great
companion plant for runner beans & French
beans. It also attracts aphid eaters, including
ladybirds, lacewings and hoverflies.
Mint
Pots of strongly-scented mint placed next to
your cabbages and cauliflowers will deter flea
beetles from laying eggs on your brassicas.
Over-run with ants? Scatter mint leaves
around infested areas – the peppermint oil is
a great natural insect repellent.
Garlic & Leeks
Plant garlic/leeks and carrots together – the
garlic will deter carrot fly whilst the carrots
repel leek moth – a WIN-WIN situation!
Word of warning – garlic can inhibit
the growth of beans & peas.
Nasturtiums
Secrete a mustard oil that many insects love,
so plant near brassicas and watch them
draw the cabbage white butterfly away from
your precious crop. Great tasting flowers too,
perfect for summer salads – just check for
bugs first!
Tagetes
Strongly scented, attractive red, yellow and
orange flowers deter whitefly – particularly
useful for planting with tomatoes in the
greenhouse. Plant near potatoes as the
Tagetes roots exude a chemical which
repels eelworm.
Top Tip for Gardeners:
For best results, spread companion plants throughout your plot rather than grouping them all together — this helps protect crops evenly and encourages beneficial insects to stay in your garden.
Happy Planting!