Torenia Fast Facts

Torenia Fast Facts image by Blue-poppy:
Torenia Fast Facts image by Blue-poppy:


Torenia, or Torenia fournieri, is an annual that thrives in a warm climate with compost-enriched soil. It needs full sun to semi-shade for nourishment. It is often started from seeds, but because the seeds are very small, they should be started at least 10 weeks before the last frost is expected.

Time Frame

The plant blooms in summer and fall, with flowers that are purple and medium blue. With an average height of 12 to 18 inches, torenia does well in borders.


Torenia needs moist, well-watered soil, especially when it's hot or windy. Check the moisture of the soil frequently by touching it with your finger. Water every two or three days. Do not leave any standing water, as this can lead to root rot.


Apply a water-soluable fertilizer for torenia to thrive. Apply once or twice a month, following the manufacturer's instructions. This is especially important during the blooming periods.

Expert Insight

Torenia requires acidic soil with a pH between 5.6 and 7.5. Use a pH test kit from a hardware store or nursery to test the soil. Increase the pH by 1.0 point to make the soil more alkaline by adding 4 oz. of hydrated lime per square yard in sandy soil, and 8 oz. per square yard in loamy soil. Add 1.2 oz. of ground rock sulfur per square yard to reduce the soil's pH by 1.0 point, to make it more acidic.


Torenia will sometimes drop its seeds, which causes new plants to grow. Watch for small seedlings to appear in the spring. Pull them out to control the growth.


  • Dave's Garden
  • NC State University

Who Can Help

  • About Soil pH
Keywords: torenia, Torenia Fournieri, annual

About this Author

Based in New York State, Kelly Shetsky started writing in 1999. She is a broadcast journalist-turned Director of Marketing and Public Relations and has experience researching, writing, producing and reporting. She writes for several websites, specializing in gardening, medical, health and fitness, entertainment and travel. Shetsky has a Bachelor of Arts in communications from Marist College.

Photo by: Blue-poppy: