Echinodorus angustifolia is unlike most of the swords one comes across in the hobby; its leaves are narrow and it remains no taller than a few inches. However, given plenty of light, nutrients and space, a plant can eventually develop to three times that height. Long before a plant reaches that height, it will have sent out runners at the substrate with plantlets starting at nodes every few inches along its length. In this way, the plant can end up in unanticipated places in your aquarium if you are not careful to keep an eye on runners and, as necessary, rein them in. You can pull out the large rosettes, leaving behind the newer plantlets that form on the runners. Or you can transplant the plantlets to new locations. Although E. angustifolia is grasslike in appearance, it doesn't usually spread out into an even cut-lawn appearance. Nonetheless, with some careful transplanting, it can fill in well enough to make a nice foreground. It is easier to grow and faster growing than a similar looking but smaller plant, E. subulata.