Amaryllis is a genus of spring and summer flowering bulb belonging to the lily family. They are prized for their opulent blooms and tall, elegant stature. Amaryllis are known to be long-lived bulbs capable of blooming for up to 75 years when cared for properly. They are grown as garden plants in the soil, in outdoor containers and also as seasonal houseplants. Fertilizing volume depends on planting type but regular feeding will ensure optimal performance and annual re-bloom.
Feed your amaryllis grown in outdoor containers or house plants once every five to six weeks with a solution of balanced, liquid plant food and water. Use only half of the recommended dose of fertilizer in a full application of water. Pour the solution over the soil evenly and allow the excess solution to drain away.
Fertilize your garden-planted amaryllis with a good-quality granular bulb fertilizer or a low-nitrogen general purpose fertilizer such as a 6-12-12 formulation. Keeping the nitrogen value lower will boost blooms and reduce leggy foliage growth. Apply according to the package dosing directions and water in well at application.
Feed your garden-grown amaryllis bulbs once in the spring when new green shoots first appear. Feed a second time when the stalk is roughly 7 inches tall and a third time immediately after they bloom to recharge the bulb for next year's flowering.