Elodea Densa is one of the most popular varieties of underwater oxygenating plants available in the UK. Also known as \'waterweed\', it is probably the most well-known of all aquatic plants. Thanks to its rapid growth it is the perfect plant for dealing with algae. This stem plant is also a popular oxygenator for aquaria and garden ponds. As with most stem plants, propagation is not complicated. Simply cut off the top or side shoots and replant them. In aquaria it may be necessary to cut the plant back often due to the speed at which it spreads. Highly recommended for stabilising new setups.