Are your crops happy bed-fellows?

Did you have resounding success last year with certain crops without doing anything 'special'? Did others fail, but you didn't know why?

Companion planting could be the answer. Plants have always lived side by side; and sometimes they have benefited from this partnership. Sometimes it hasn't worked out quite so well.
Companion planting involves growing a combination of plants that are of mutual benefit. Some have obvious benefits - growing carrots next to members of the allium family (onions, leeks, garlic etc) confuses and deters both the onion and the carrot root fly because the plants are so strongly scented. Herbs also have their uses - tarragon repels pests and is said to improve the flavour of most vegetables.

Here is a brief guide to companion planting - wherever possible, 'bad matches' should be planted as far away from each other as is feasible within your raised bed.

Beans
Love: Squash, sweetcorn, cucumbers, potatoes (dwarf beans only), celery, rosemary, sage, tarragon
Hate: Onions, leeks, garlic, chives

Broccoli / Calabrese
Love: Chamomile, peppermint*, dill, sage, rosemary, chives, tarragon
Hate: Strawberries, tomatoes, climbing beans

Cabbages / Kale
Love: Celery, onions, mint*, nasturtiums, dill, rosemary, oregano, chives, chamomile, sage, thyme
Hate: Strawberries, tomatoes, climbing beans

Carrots
Love: Lettuces, radishes, onions, tomatoes, garlic, leeks, chives, sage, tarragon
Hate: Dill

Cucumbers
Love: Sweetcorn, beans, garlic, nasturtiums, oregano, chamomile, tarragon
Hate: Sage

Fennel
Love: Tarragon
Hate: Coriander

Garlic
Love: Carrots, onions, tomatoes, tarragon
Hate: Beans

Onions, Leeks, Spring Onions
Love: Tomatoes, carrots, chamomile, tarragon
Hate: Beans

Peas
Love: Beans, carrots, celery, chicory, sweetcorn, cucumbers, peppers, potatoes, radishes, spinach, turnips, parsley, rosemary, tarragon
Hate: Onions, chives, garlic, leeks

Peppers
Love: Basil, oregano, tarragon, peas

Potatoes
Love: Dwarf beans, brassicas, coriander, oregano
Hate: Rosemary, tomatoes

Pumpkins and Squash
Love: Sweetcorn, beans, cucumbers, oregano, tarragon
Hate: Sage

Radishes
Love: Peas, cucumbers, tarragon

Tomatoes
Love: Onions, basil, mint, parsley, petunias, French marigolds, chives, oregano
Hate: Potatoes, sweetcorn, kohlrabi, dill

*If you are growing mint, please grow it in a submerged pot in your bed, unless you fancy a raised bed full of rampant mint!

Sources:
Alys Fowler, The Edible Garden (BBC Books)
Dave and Andy Hamilton, The Self Sufficient-ish Bible (Hodder and Stoughton)
Brenda Little, Companion Planting (New Holland)