How to Fertilize an Agapanthus

Potted Agapanthus

• 1

  Dilute a 10-10-10 or similar balanced fertilizer with water at half the strength recommended on the fertilizer label.

• 2

  Water the plant with the fertilizer water once monthly during the spring and summer months. Fertilizers leach from potted plants more quickly than from soil in beds, so monthly fertilizer is necessary to replenish soil nutrition.

• 3

  Stop fertilizing the plant in fall and winter. Agapanthus enters a period of slow growth in winter and doesn't require additional soil nutrients. Resume fertilization in spring as the plant begins putting on new growth.

Garden Agapanthus

• 4

  Sprinkle 1 cup of 14-14-14, or a similar blend, of slow-release fertilizer along every 10 feet of agapanthus row in spring as new growth begins. Apply the fertilizer the soil 6 inches away from the base of the plants.

• 5

  Water the bed immediately after fertilization. The water helps the fertilizer soak into the soil where the roots of the agapanthus have access to the nutrients.

• 6

  Reapply the fertilizer two months later in early summer. Make a final application in late summer or early fall, two months after the previous application. Water the bed thoroughly after each application.