Elodea Densa excellent oxygenating plant. The most popular aquarium/pond plant by far. This fast growing pond plants will do well in most situations. Just drop into shallow water (not deeper than 50cm) and watch it grow. Often used in school biology experiments to show the processes of photosynthesis. All products are sent on the day of picking to get them back in water ASAP They will need to be placed in water immediately after opening.