Does anyone know why my mints leaves are changing color and turning almost white? I only water when the soil is dry or the leaves are beginning to droop. It is sitting on a south-facing windowsill and gets plenty of sunlight. I recently repotted into a slightly bigger plot since it was outgrowing its old one. I repotted with an equal amount of peat moss, perlite, and compost. But, this issue started before I repotted.