All types of Lobelia are said to be toxic in varying degrees, containing alkaloids, a glycoside, and other harmful substances. Possible toxic effects are ulceration around the mouth, nasal discharge and anorexia, so one to remove from the tortoise's reach.
Lobelia vedrariensis and Lobelia cardinalis are suitable for boggy areas as well as the flower garden. The plants contain the alkaloids lobelamine and lobeline, and could cause exhaustion, nausea, diarrhoea, convulsions and coma. All parts of the plants are toxic if ingested, so not ones to have near tortoises or turtles.