Note: Make sure they are organic or if wild strawberries, make sure you pick the leaves in a clean place free of spraying, away from highways or roads where there is car , bus or truck traffic or where people walk their dogs. Another important point is to pick the leaves early before the fruit forms. The fruit takes much of the plants power later in their growing season.
I have picked wild raspberrry and blackberry leaves and used them for tea also. They are high in vitamin C plus other good qualities and taste good as tea.
I pick the leaves and put them in a paper bag to dry. After that to a sealed glass jar to last the winter months.