Blue Hygrophila (Hygrophila Salicifolia)

Yes, it is one of the easiest and most forgiving stem plants. It grows fast in everything from low-tech tanks to high-tech, CO2-injected setups, and tolerates a wide range of light and water conditions. Because it grows quickly it also pulls excess nutrients out of the water, which helps keep algae in check. A great choice for beginners and for filling space fast.

No. Blue Hygrophila grows well without CO2, just a bit slower and greener. Adding CO2 along with good light and fertilizer speeds growth and brings out the cooler blue-violet tones in the tops. It is happy either way, which is part of what makes it so easy to keep.

Color comes mostly from light. Under strong lighting the new growth shows the blue-green to violet tint the plant is named for, while in low light it stays green. Adding iron and keeping nitrates a little leaner helps the color develop. The tops always show the best color, so regular trimming keeps fresh, colorful growth coming.

Plant the stems individually in the substrate, spaced slightly apart so light reaches the lower leaves. It grows fast, so trim the tops regularly to keep it bushy and control the height. Replant the healthy trimmings and they root quickly, so you can build a thick background stand in no time.

It works best as a background plant, since it grows tall and fast. Plant it in a group along the back or in the corners for a full, leafy backdrop, and trim as needed to hold the height you want. Its willow-like leaves make a soft contrast behind broader-leaved plants.