Companion planting

Friendly neighbors and a few combinations to give extra space. Pairs with What can I grow? when you are sketching beds. For fallow gaps and soil recovery, see cover crops.

Type

All Good neighbors Give space

Crop focus

Any Tomato Pepper / eggplant Brassicas Squash / cucumber Beans / peas Carrot / root crops Corn Lettuce / greens Radish Onion / garlic Herbs

Benefit

Any Pest confusion / trap Pollinators Shade or shelter Soil / roots Kitchen / flavor

Brassicas & dill (early season)Pair
Broccoli / kale / cabbage · Dill
Young dill can attract beneficial wasps and hoverflies; mature dill near heading brassicas is more controversial—plan dill as an early neighbor or at row ends.
Calendula near vegetablesPair
Calendula · Mixed veg bed
Long-blooming calendula supports generalist pollinators; some predatory insects visit composite flowers—pair with good habitat, not sprays.
Avoid: tight tomato + brassica spacingAvoid
Tomatoes · Broccoli / kale
Both are heavy feeders with big root systems; crammed together they compete for water and nutrients and reduce airflow.