Marginals

These plants can be planted in three main ways: in a special planting basket, in a permanent bed or directly in the soil at the bottom of the pond. Most are planted into planting crates of various sizes, which makes it possible to move them around on the marginal shelves. The size of the container will relate to the vigour of the plant, because this will determine its ultimate spread and height.

When you are choosing the container, take into account how much restraint is required and the depth of water in which the container is to be positioned. Many marginals require only shallow water over their crowns, and this factor will affect the depth of the container when it is standing on a typical marginal shelf, 23cm (9in) deep. Ensure that the plant is securely held in the soil, which must be covered with a good layer of gravel if it is to be submerged. Do not bury the roots too deeply and ensure that they are spread out adequately in the container.

Marginals can also be planted into permanent beds, which are constructed when the pool is built. Permanent planting beds can be built behind the rocks when constructing a pond, or more substantial planting beds can be made by building retaining walls with brick or walling stones. These are made when the pool is originally constructed and should be built so that the tops of the retaining walls are just below the waterline. Planting into this type of permanent bed allows some intermingling of species and looks more natural. Greater care is required in the plant choice and positioning so that the vigorous species do not overrun their neighbours.

Some marginals can be planted in the soil that covers the whole submerged area of a wildlife pool. There are no restrictions on the root systems of such plants, which will spread very rapidly. This may be acceptable in a wildlife pool but is not recommended in a small ornamental pool.

 Planting a Marginal

Marginals can be planted in a planting basket and then submerged in the pond.

1. Half-fill a medium-size planting crate with aquatic planting compost (soil mix).

2. Check that there is ample depth in the container to bury the plant to the same depth as its previous planting, taking care not to bury too deeply.

3. Place the plant near the centre of the container and add the compost (soil mix) so that the losse compost reaches the rim.

4. Firm the compost (soil mix) thoroughly around the roots and base of the leaves,

5. Spread a layer of washed pea shingle or gravel over the compost (soil mix) to prevent the soil particles from floating.

6. Place the freshly potted plant on to the marginal shelf of the pond.