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A water rill and sunken seating area in a courtyard garden with planting of Acer, Buxus, Iris and Alchemilla

Planting. Rills are well suited to planting marginal water plants. The shallow depth and level of water make them the perfect home for a range of marginals. Architectual plants look the most effective in the formal structure of the rill, and of these I would recommend: Scirpus tabernaemontani 'Zebrinus' (Zebra Rush)Juncus effusus 'Unicorn' (Unicorn Soft Rush)Iris pseudoacorus 'Variegata' (Variegated Yellow Flag)We can see in the raised formal rill above both architectural plants and water…

Tom Stuart-Smith. Betula nigra, cloud-pruned Buxus sempervirens, and under planting of woodland flowers, dominated by grasses, Euphorbias, blue Iris sibirica and fresh white flowers.