PlantDoc® is a patent-pending, completely biodegradable & plastic-free color-changing moisture meter for plants. A fun and vivid visual guide to houseplant watering, PlantDoc® is perfect for new plant parents and anyone learning about how moisture affects their plants' health. PlantDoc® works by absorbing water from the soil just like plants do. When the soil is wet, PlantDoc absorbs the moisture and changes color from white to a green cactus design. As the soil dries out, PlantDoc returns back to white from top to bottom. Unlike other stay-in moisture meters, PlantDoc® is affordable, home-compostable, AND easy on the eyes! We include a small display tent with how-to-use instructions with each order, and are also happy to send free samples BEFORE you order - please DM. Designed in Oregon. Want to CUSTOMIZE PlantDoc with your logo or shape? We'd love to help. Contact us!