Lily of the valley, Convallaria majalis, is a fragrant, spring-flowering perennial. While its white, bell-shaped blooms are pretty, and it can make a ground cover plant for often-trickier shadier spots, its tough and aggressive nature often makes it troublesome.
The plant is renowned for spreading and has led to it being black-listed in certain areas, so it is best to check local advice before planting. If you already grow lily of the valley, prepare for it to spread, and its growth habit will lead to overcrowded clumps that need dividing to perform at their best.
