Big Blue Liriope. In my opinion, Liriope is one of the finest evergreen perennials that one can plant. It is trouble free and has great flowers over a long period during the late spring and summer and is easily maintained. 'Big Blue' is one of the oldest cultivars with its 14" leaves and even taller flower spike of lavender-purple flowers. It is best to cut the foliage down in late winter so that new fresh leaves can emerge without being mixed with the old. I think that it is best used in mass rather than in rows. It will grow in sun or shade and is fairly drought tolerant once established.