Aponogeton ulvaceus
Aponogeton ulvaceus
Also known asUlvaceus · Wavy-edged aponogeton
Water parameters
Light and nutrients
Substrate type: any. Propagation: bulb.
Substrate compatibility
| Substrate | pH effect | Nutrient load |
|---|---|---|
| Inert sand (Pool filter sand) | neutral / inert | none |
| Inert gravel (Aquarium gravel) | neutral / inert | none |
| Aquasoil (ADA Amazonia) | lowers pH | very high |
| Mineralized clay substrate (Seachem Fluorite) | neutral / inert | moderate |
| Dirted tank (mineralized topsoil) (DIY soil substrate) | slightly acidic | very high |
With fish
Origin and habitat
Native to Madagascar, where it grows in slow-moving streams, pools, and lake margins. The species (Aponogeton ulvaceus) produces some of the most dramatic foliage in the aquarium plant hobby: broad, translucent, bright green leaves with wavy to heavily ruffled margins that can reach 50–60 cm long. The leaves are thin and delicate, with a texture resembling sea lettuce (Ulva, hence the species name). A mature specimen in full growth is one of the largest and most visually striking aquarium plants available. The plant grows from a bulb and, like other Aponogetons, may go through periodic dormancy where it dies back to the bulb before regrowing. Native to a tropical island with stable warm temperatures, so it tends to have less pronounced dormancy than temperate Aponogeton species.
Care notes
A showpiece plant for medium to large tanks (120 L) with moderate to strong lighting. Plant the bulb with the top half exposed above the substrate. The long, wavy leaves need space; a mature specimen can easily fill a 30 cm radius with flowing, translucent foliage. In current from a filter outlet, the ruffled leaves create a dramatic waving effect. Heavy root feeder; root tabs are essential. Water column fertilization (nitrogen, phosphorus, potassium, iron, micronutrients) supports the fast growth rate. Without adequate nutrition, the new leaves emerge smaller and less ruffled. CO2 injection is not strictly required but significantly improves growth vigor and leaf size. Growth rate under good conditions is fast: a new leaf every 2-3 days, each one potentially 30–50 cm long. Dormancy occurs but is less predictable than with temperate Aponogetons. Some specimens grow continuously for years; others rest periodically. If the bulb goes dormant, leave it in the substrate and wait; it usually regrows within a month or two. Propagation by daughter bulbs or by seed (the flower spike must reach the air above the water surface to pollinate). The plant has a reputation for being dramatic but temporary; some specimens grow vigorously for 6-12 months then decline. This is usually related to nutrient exhaustion in the bulb or the onset of dormancy rather than actual death. Replenish root tabs and be patient. Compatible with most community fish; only dedicated herbivores (silver dollars, Buenos Aires tetras) damage the delicate leaves.