[2] The submerged leaves are reduced to phyllodes at the base of the stem, but elsewhere are broad and translucent, yellowish to dark green, sometimes with a pinkish tinge.

Unlike P. lucens, Potamogeton × angustifolius sometimes produces floating leaves, which are opaque and typically 55-105 × 22–40 mm.

There is a tendency for main stems to more closely resemble P. lucens, and side branches P. gramineus.

Potamogeton × angustifolius is not in general cultivation, though like both of its parents it is an attractive plant and easy to grow.

In common with other pondweeds of this group it roots poorly from stem cuttings and is best propagated by division of the rhizomes.