They are vital if you have fish in your pond as they add oxygen to the water. You can have deep marginals that happily sit in 15-30cm of water and shallow marginals – try Japanese iris ...

Its beautiful flowers and water-purifying qualities make it a valuable addition to any pond garden. Japanese Iris (Iris ...

Look out for the white, umbrella-like flower heads of lesser water-parsnip along the shallow margins of ditches, ponds, lakes and rivers. When crushed, it does, indeed, smell like parsnip! The lesser ...