"Plants have best friends just like people do. Marigolds help tomatoes and roses grow better. Nasturtiums keep bugs away from squash and broccoli. Petunias protect beans from beetles and oregano chases them away from cucumbers. Geraniums keep Japanese beetles away from roses and corn. Chives make carrots sweeter, and basil makes tomatoes even tastier":
How to grow the sweetest sweetcorn. The importance of planting in a block as sweetcorn is wind pollinated. The companion planting of corn, beans and squash together as the 3 sisters guild. How to check when corn is ready to harvest and 2 useful articles to read from growveg.com about corn and how to grow it successfully. A great crop even for a small garden, a small block of 10 plants can give you that straight from the garden taste lacking in so much store bought corn.
Basil attracts butterflies and repels other pests. Oregano repels aphids. Carrots attract insects beneficial to the garden particularly the tomato. (See more Carrot Companions) Onions/Chives repel pests.