Wildflowers of Toronto's High Park​​

An ​oak savannah is a community of widely spaced oak trees with a ground layer of grasses and wildflowers which exists in poor, well-drained soils and is dependent on periodic fires to create conditions needed for successful reproduction.
​Prescribed burns, carried out in High Park each spring, promote the growth of oak seedlings, rare shrubs, native sedges, prairie tall grasses and herbaceous plants, including wild lupines, woodland sunflowers, wild geranium and early meadow-rue.

Fire releases seeds stored in the soil and encourages the sprouting of established plants. It burns off dead vegetation, allowing acorns to come into contact with the earth and seedlings to receive more sun, and the conversion of leaf litter into ash releases nutrients which boost plant growth. Burns also control some species of invasive plants.