The difference between plant humidifiers and plant vaporizers is that plant vaporizers are used to ensure plant health when the plant is kept in a steamy environment. Plant vaporizers are used when grow lights are installed directly above the plant, where there is heavy plant water, or when the plant receives drip-feed regularly. A plant vaporizer releases steamy steam to warm up plant parts to absorb more nutrients and moisture needed for plant growth. Whereas a plant humidifier is an appliance that releases a fine mist of water into the air to help plant leaves stay hydrated.