Tomatoes + basil
A popular pairing when tomatoes are supported and basil has sun.
Companion planting planner
Companion planting tool for raised beds
Companion planting is most useful when it supports spacing, airflow, pollinators, and harvest timing. Treat strong claims cautiously and start with combinations that are easy to maintain.
Use companion planting as a layout check
Good companions still need their own space. Basil near tomatoes is helpful only if both plants get enough light, water, and airflow.
Prioritize compatible growth habits
Pair tall supported crops with lower herbs or greens, and avoid letting aggressive plants shade or smother slower crops.
Be cautious with folklore
Many companion claims are anecdotal. The safest benefit is often better space use, pollinator access, and simpler harvest routines.
Carrots + lettuce
Different root depths and harvest timing can make compact use of bed space.
Cucumbers + herbs
Trellis cucumbers so nearby herbs are not buried under vines.
Frequently asked questions
Does companion planting replace spacing rules?
No. Companion planting should support a layout, not override mature plant size, airflow, or harvest access.
Sources and local checks
Use these pages as planning starting points, then confirm exact dates with local frost-date and extension guidance.
- University extension vegetable gardening resources
- USDA Plant Hardiness Zone Map
Next step
Calculate the main crop first, then add companion plants only where the bed still has usable space. Open the calculator with these defaults, or check the monthly sowing calendar before you plant.