[mass noun] An ornamental water plant with long oval floating leaves and erect aromatic flower spikes, native to the South African province of Western Cape where the flower spikes are used in cooking.
- ‘There are much less likely to consume your water hawthorn and oxygenators.’
- ‘And add plant oxygenators, like Vallisneria and plant these next to water hawthorns or water lilies.’
- ‘The real value in the water hawthorn is its growth cycle.’
- ‘Apart from the water hawthorn, which has barely flowered this year, everything I have planted has grown at an astonishing rate, sending out roots and suckers, seeding new plants.’