July Plant of the Month: Salvia (Icing Sugar). A diverse group of plants ranging from annuals to herbaceous perennials, evergreen perennials and herbs. It is free flowering, making a great colourful display in borders during July until frost during which time it is good at attracting butterflies and bees. Salvias are a sun-loving plant, so grow in full sun. Soils need to be well-drained and moderately fertile.