This plant is so hardy as to survive even the harshest of European winters, bouncing back into life every spring without fail.
The most important thing to remember about this plant is that it absolutely loves moisture and, unlike most plants, does best in poorly-drained soils. This is because it grows naturally in marshland or on damp riverbanks. It is particularly happy in heavy clay soils that do not readily dry out.
Whether you plant it in full sun or partial shade, in an exposed or sheltered location, ensure its water needs are met and you’ll have a happy plant on your hands.