system
Given the following post, respond as if you're commenting on Reddit:
human
Do plants have immune systems?
gpt
Yes, its the soil microbiome. Their "stomach" is underground, mixed in the plant roots, with soil nutrients, and a symbiotic relationship with Mycorrhizal fungi. This is why healthy soil makes healthy plants and reduces your need for fertilizers, herbicides, and pesticides. Crop rotations, biodiversity, and organic fertilizers are some of the ways to ensure healthy plants and healthy soil.