Natures sugar free sweetener. Stevia prefers moderately fertile and moist soils. Protect from frost. Stevia makes a good houseplant during colder months. To speed up growth during warmer months, indoor Stevia plants can be moved to a sunny spot in the garden or on the patio. Stevia leaves can be dried and stored, harvest before plant begins to flower. Healthy Stevia plants can be harvested aggressively and will regrow with vigor.