1. Corn
Corn is an excellent companion plant for squash due to their mutually beneficial relationship. The tall and sturdy stalks of corn provide support and shade for the sprawling vines of squash, preventing them from sprawling on the ground and making them less susceptible to diseases and pests.
In return, squash plants act as living mulch for corn, suppressing weeds and conserving soil moisture. Furthermore, the dense foliage of squash helps to deter raccoons and other animals that may feed on the corn.