1-2-Grow! Najas 'Guppy Grass'Najas guadalupensis 'Guppy Grass'. Originating from the USA and South America, Najas guadalupensis is an exceptionally easy aquatic plant that thrives under almost any conditions. It grows quickly and propagates effortlessly, making it ideal for beginners as well as experienced aquarists. Although usually kept as a free floating plant, it may anchor itself in the substrate with long, delicate roots. The fine, porous structure provides excellent