Ludwigia Glandulosa

Ludwigia glandulosa is a highly striking, deep red to purple aquatic stem plant native to the wetlands of the southeastern United States. Also known as the cylindricfruit primrose-willow or small-flowered seedbox, it is famous in the aquascaping community for its intense burgundy coloration, which provides a dramatic contrast against green aquarium backdrops.

This is an intermediate to advanced care plant because it requires strong lighting and carbon dioxide (CO₂) injection to maintain its vibrant red color and healthy growth. Without proper conditions, it will easily lose its lower leaves or turn entirely green.

Key Requirements for Vibrant Coloration

High Lighting Intensity: Light dictates the color. Under weak or moderate light, the plant turns green. Intensive, full-spectrum LED lighting forces shorter leaf nodes and triggers the brilliant red and purple hues.

CO₂ Injection: While it can survive without it, CO₂ is highly recommended. It grows exceptionally slowly under anaerobic or low-CO₂ conditions. Supplementation guarantees faster, fuller growth.

Heavy Iron & Nutrient Dosing: To bring out the deepest burgundy shades, the plant requires a rich environment. Regular liquid fertilizer dosing and a nutrient-dense substrate (or root tabs) high in iron are vital.

Planting, Trimming, and Propagation

Planting Spacing: Never bunch stems tightly together. Plant individual stems a few centimeters apart so that light can easily reach the lower leaves. If shadowed, the lower leaves will rot and fall off.

Substrate Strategy: Use fine gravel or specialized aqua-soil. When burying the stem, only submerge the roots; do not bury any low-lying leaves to avoid stem rot.

Trimming for Bushiness: Left alone, it grows in a tall, vertical line. Cut the top of the stem to encourage the plant to branch out into a bushier shape.

Propagation Method: Propagating is easy via head cuttings. Simply snip a healthy top portion of the stem right below a root node and press it directly into the substrate to establish a new plant.