A computer-implemented method includes receiving a reference image of an outdoor area, identifying that a portion of the outdoor area shown in the reference image corresponds to living vegetation, determining, from multiple images of the outdoor area, a reference color that corresponds to a dry condition in the portion of the outdoor area, receiving a sample image of the portion of the outdoor area, determining that a sample color of the portion of the outdoor area shown in the sample image corresponds to the reference color, and based on a determination that the sample color of the portion of the outdoor area shown in the sample image corresponds to the reference color, triggering a watering device to provide water to the portion of the outdoor area.
