How to Grow Agapanthus Indoors

The lily of the Nile, or agapanthus, only thrives outdoors in warm tropical and subtropical climates. Although the plant tolerates temperatures down to 18 degrees Fahrenheit, prolonged freezing kills the plant. Growing agapanthus as a potted plant allows you to keep it alive year-round. Grow your agapanthus as a houseplant or bring it indoors only for the winter months. You'll be rewarded with attractive flowers, primarily during the summer months but sometimes also in winter.

Pot
Potting soil
Drip tray
Soluble houseplant fertilizer

Instructions

- 1
  Plant agapanthus in a 20- to 24-inch diameter pot. Fill the pot with potting soil to within 2 inches of the rim. Plant the agapanthus so the top of the rhizome sets just beneath the surface of the potting soil.
- 2
  Set the pot indoors in a brightly lit window that receives direct sunlight for most of the day. For the outdoors, place the pot in a full sun location, though light afternoon shading is suitable for outdoor plants.
- 3
  Check the soil moisture in the pot daily during the spring and summer months. Water the pot when the top half-inch of soil feels dry. Place indoor pots on a drip tray so any water that drains from the pot during irrigation is confined. Empty the drip tray after watering.
- 4
  Fertilize agapanthus in spring as new growth begins to emerge. Apply a soluble balanced fertilizer to the soil weekly, following the rate and application instructions on the fertilizer package.
- 5
  Bring outdoor agapanthus indoors before frost. Place the pot in a warm, sunny location.
- 6
  Reduce watering as the days shorten in late fall and as growth slows on the agapanthus. Water the plant sparingly once or twice a week so the soil doesn't dry completely.

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