Heliotropes are known for their classic beauty and sweet aroma. With hints of vanilla, these plants form showy clusters of purple flowers. They are drought tolerant, and the deer hate them. Plant in partial sun in well-draining soil, as Heliotrope will suffer in heavy clay. They prefer morning sun over the hot afternoon sun. With average watering needs, be careful not to overwater as it is susceptible to powdery mildew.