Light:

Full sun (southern exposure).

Temperature:

As a potted plant, maintain indoor temperatures above 40°.

Humidity:

Maintain a 50% or higher; however, they will tolerate low levels with no harm.

Watering:

Bring soil to a state of visual dryness between watering. When watering, thoroughly saturate soil until a little water runs out of the bottom of the pot.  Under high heat and sun be careful not to subject them to severe wilts.

Fertilizer:

They are moderate to heavy feeders so a 1/2 tsp./gallon once a week is a general recommendation, or ¼ tsp at every watering throughout the growing season.  When growth slows in winter, discontinue feeding.  Use a balanced fertilizer, i.e. 15-15-15 or a blooming fertilizer like Pro Gro ‘Grow’ 7-9-5 or Electra 5-10-3.

Comments:  

Heliotropium are fast and easy to grow, and bring months of continuous bloom and fragrance to the garden and potted container.  They do require lots of direct sunlight and as soon as the light levels drop they go out of flower.  For best growth and flowering they prefer cooler temperatures.