Companion Planting Guide

Introduction to Companion Planting

Companion planting is an age-old gardening technique that involves growing different plants together for mutual benefit. This practice harnesses the natural relationships between plants to create healthier, more productive gardens with fewer pest problems. By understanding which plants complement each other, you can design a garden ecosystem that works in harmony with nature.

How Companion Planting Works

Companion planting works through several mechanisms:

• Chemical Interactions - Some plants release compounds that repel pests or inhibit weed growth.
• Physical Support - Tall plants can provide shade or support for climbing plants.
• Nutrient Sharing - Deep-rooted plants can bring nutrients to the surface, benefiting shallow-rooted neighbors.
• Pest Confusion - Mixing plant types makes it harder for pests to find their preferred hosts.
• Beneficial Attraction - Certain plants attract predatory insects that control garden pests.

Popular Companion Planting Combinations

Plant	Good Companions	Benefits
Tomatoes	Basil, Marigolds, Carrots, Onions	Repels hornworms and whiteflies; improves flavor
Corn	Beans, Squash, Pumpkins	Beans fix nitrogen; squash suppresses weeds (Three Sisters method)
Cabbage Family	Dill, Mint, Rosemary, Sage	Repels cabbage moths and aphids
Carrots	Onions, Leeks, Rosemary, Sage	Repels carrot fly; improves flavor
Lettuce	Carrots, Radishes, Onions, Chives	Maximizes space; repels aphids
Peppers	Basil, Onions, Oregano, Spinach	Repels aphids and spider mites; provides shade
Cucumbers	Radishes, Marigolds, Nasturtiums	Repels cucumber beetles; deters pests
Beans	Corn, Squash, Carrots, Cabbage	Fixes nitrogen; provides support for corn

Plants to Avoid Together

Just as some plants benefit each other, others can inhibit growth or attract pests when planted together:

• Tomatoes & Potatoes - Both are susceptible to blight and can spread disease to each other.
• Beans & Onions/Garlic - Onions can inhibit the growth of beans.
• Cabbage Family & Strawberries - Strawberries can inhibit cabbage growth.
• Carrots & Dill - Mature dill can stunt carrot growth.
• Corn & Tomatoes - Both are heavy feeders and compete for nutrients.
• Cucumbers & Potatoes - Can increase potato blight risk.

Companion Planting by Garden Type

Vegetable Gardens

In vegetable gardens, focus on combinations that maximize space and reduce pest problems:

• Interplant fast-growing radishes with slower-growing carrots.
• Plant marigolds throughout the garden to repel nematodes and other pests.
• Grow herbs like basil and dill among vegetables to attract beneficial insects.
• Use tall plants like corn or sunflowers to provide shade for heat-sensitive crops.

Herb Gardens

Herbs make excellent companions for many plants:

• Plant basil near tomatoes to improve flavor and repel pests.
• Grow mint near cabbage family plants to deter pests (keep mint contained).
• Use rosemary to repel carrot fly and bean beetles.
• Plant dill near cucumbers to attract beneficial insects.

Flower Gardens

Flowers aren't just beautiful—they're functional companions:

• Plant marigolds throughout vegetable beds to repel pests.
• Grow nasturtiums as a trap crop for aphids.
• Use sunflowers as a living trellis for climbing plants.
• Plant alyssum near vegetables to attract beneficial insects.

Designing Your Companion Garden

When planning your companion garden:

• Observe Sun Patterns - Place taller plants where they won't shade sun-loving crops.
• Consider Growth Habits - Match plants with complementary growth rates and sizes.
• Plan for Succession - Use fast-growing plants to provide temporary shade for seedlings.
• Rotate Crops - Change plant families each year to prevent disease buildup.
• Start Small - Begin with a few proven combinations before experimenting.