• Easy to use formula for beautiful houseplants, no mixing or measuring, no wasteful runoff, no mess, hazards or smells. • Contain an improved greenhouse tested formula that provides quick-greening and long lasting nutrients. • Just push each spike into the soil around the plant, halfway between the plant stem and the edge of the pot, until the spikes is just below the surface; water after inserting spikes. • Nutrients are gradually released to the plant roots, safely and continuously, every day.