PlantDoc® is a patent-pending, completely biodegradable & plastic-free, color-changing moisture guide for plants. 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 Rhaphidophora tetrasperma design. As the soil dries out, PlantDoc returns back to white from top to bottom. PlantDoc provides a fun, vivid and visual way to guide your houseplant watering and is great for new plant parents and anyone learning about how moisture affects their plants' health. Unlike other stay-in moisture meters, PlantDoc® is affordable, completely biodegradable AND easy on the eyes! WE RECENTLY LEARNED A HARD LESSON that we need to share better information on HOW to use PlantDoc so that it 100% works as described. We will include this info with your order. We are also happy to send free samples BEFORE you order - please DM. FAQ's at https://daphnesbotanicals.com/pages/faqs. Designed in Oregon.