Several flowers can work as natural pest control in the garden. Here are some of them:

• Basil: The scent of basil repels several pests including asparagus beetle, carrot fly, and whitefly.
• Nasturtiums: Known as a "trap crop," they attract cabbage moths, aphids, whiteflies, squash bugs, and cucumber beetles to their leaves. Nasturtiums and asparagus work great together.
• Petunias: These bright annual flowers can help protect your vegetable garden. Petunias repel aphids, tomato worms, squash bugs, and some types of beetles. They let off a light licorice smell which some insects detest, although it can attract caterpillars and slugs.
• Chrysanthemums: These common garden plants can help you keep roaches, ants, beetles, ticks, lice, fleas, and mites away from your home. Chrysanthemums are part of the Pyrethrum genus. Extracts from mums, and other flowers in this category, can actually kill many of these insects. In fact, it’s a common ingredient in many residential insecticide products.
• Marigolds: The marigold is probably the most well-known plant for repelling insects. French marigolds repel whiteflies and kill bad nematodes. Mexican marigolds are said to offend a host of destructive insects and wild rabbits as well.

Using flowers as natural pest control not only cuts down on your workload, but it also reduces the amount of pesticides that you have to resort to. Fewer pesticides mean more good bugs, which in turn means help in controlling bad bugs.