Oregano is a very aromatic herb, which helps repel pests such as aphids and spider mites. It can also help attract pollinators and predatory insects, such as ladybugs, bees, and butterflies.
Beans add nitrogen to the soil, which makes them great eggplant companion plants, as eggplants are heavy feeders. Plus, you can grow both plants in the same pot.
Spinach is ideal for growing in the same pot because the larger eggplant provides its delicate leaves with shade in the height of summer.
Marigolds are one of the best all-around companion plants for crop gardens. They help attract pollinators and deter a range of pests. For best results, grow them nearby as many crops as you can.
Borage is another useful herb for repelling pests. Specifically, it can repel worms, so it’s worth growing in the same soil. As with spinach, you don’t need a special planter for this.