"What are marginal pond plants?" I can hear your ask. Some will know the answer, but many won't - so let's take a brief look at the role of plant marginals in ponds:
Marginal pond plants grow in the shallow ends of the pond - not only do they (marginal plants) bring shape to the edge of the ponds, they also provide colour throughout the growing season.
Ideally, ponds should contain 2-3 marginal plants per metre of space, but our ponds are only small so we have planted 1-2 marginal plants per metre around the edge of our pond.
These marginal plant roots have been placed in a mesh container under the water to keep them together so that they can't be separated on a windy day.
Marginal plants should be positioned at a depth of no more than 0-5cms water over the soil and stones.