Tomatoes thrive when grown alongside companion plants such as basil, nasturtiums or marigolds, according to specialists at Obsessed Lawn. These beneficial neighbours don't just help to "repel pests" – they can also "enhance" the flavour of your tomatoes. Nasturtiums prove particularly useful in deterring whiteflies and aphids, which frequently plague fruit crops during the warmer months. Peppers make excellent companions too, whilst spinach, lettuce and carrots will support tomatoes in