Of the thousands of plants that are genuinely aquatic, or only amphibian, only
a few hundred are to be found in the aquarium trade. The vast majority of these
come from tropical fresh water, with the remainder coming from northern climes,
and therefore suitable for temperate aquariums and garden ponds. The most common
plants are generally the most robust, and are therefore specially suitable for beginners.
Others are best left to committed aquarists keen to create a veritable aquatic garden.
The special plants - the floating species, mosses, and ferns - have been grouped
together, on account of their exceptional lifestyle; they should be of interest
to all aquarists.