Jobe’s SmartSpike by Easy Gardener is designed specifically for
containers to help gardeners supply plants with the proper amount of
nutrients. The transparent plastic tube contains Jobe’s All-Purpose
formula and feeds plants at the root. There’s no mixing or measuring
required and the adjustable dial allows gardeners to match the
fertilizer release rate to the pot size. Watering the plant activates
the spike’s pump providing the plant with the right amount of
nutrients, at the right time in the right place.