Add 1 tsp. of liquid food coloring to 1 cup of water. Drizzle the colored water onto the soil surrounding the base of a plant. Wait 24 hours for the water to absorb. Apply another identical dose if the color change was not sufficient.
Je dois vraiment avoir des plantes cet été ! I like the idea of an enclosed or open terrarium in one of my leftover mason jars in a dorm room. Need some natural things to save me from the 6 stories of fluorescent lighting.