They flower in all seasons except winter. W ater primroses grow to five or six feet tall. Stems are branched and sometimes have long hairs. The leaves are ovate to lance-shaped, and up to six inches long. Leaves are covered on both sides by minute soft hairs.
Water primroses have conspicuous yellow flowers .
The flowers have four or five petals. Water grass W ater grass is a true aquatic grass that looks very much like lawn grass. It grows floating and trailing across the water. Water grass is found in shallow, slow moving waters. T he slender main stems of water grass are submersed, while most of the leafy upper branches are emersed.