These beautiful day lilies are perfect for spicing up your summer borders one of the easiest hardy perennials to grow hemerocallis quickly establishes a strong root system that produces masses of flowers in summer each one is short lived hence the name day lily but quickly replaced by many more flowers each will grow to around 60cm 24 inches and will thrive in well drained pots or borders like many herbaceous perennials they will die back in winter to re emerge bigger and better next s