Tomatoes, Basil & Marigolds - What Pests Do They Deter?
Beginner Companion Planting Layout: Tomatoes, Basil & Marigolds
This simple raised bed layout is one of the easiest companion planting combinations for beginner organic gardeners: tomatoes in the center, basil nearby, and marigolds around the border.
The tomato plant is placed in the middle or slightly toward the back of the bed because it will grow the tallest and needs room for a cage, stake, or trellis. Tomatoes need plenty of sun and airflow, so avoid crowding plants tightly around the main stem. Good spacing helps leaves dry faster after rain or watering, which can reduce common tomato problems caused by damp, crowded foliage.
Basil is planted near the tomato, but not directly pressed against it. Giving basil about 12 to 18 inches of space keeps both plants healthy while still letting them grow close enough to function as companions. Basil’s strong scent may help confuse or deter pests such as aphids, whiteflies, thrips, mosquitoes, and flies.
Marigolds are planted along the front edge and border of the bed. They add cheerful color, attract beneficial insects, and may help deter pests such as aphids, whiteflies, tomato hornworms, and root-knot nematodes. French marigolds are especially known for helping with nematode pressure in the soil, although they work best when grown as part of a longer-term garden plan.
This layout works because each plant has a job. The tomato gives you the harvest, the basil gives you fresh herbs and aromatic pest support, and the marigolds bring flowers, pollinator appeal, and extra garden protection.
It is pretty, practical, beginner-friendly, and perfect for raised beds, backyard gardens, or anyone starting an organic garden one small step at a time.

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