Dwarf sagittaria
Sagittaria subulata
Also known asDwarf sag
Water parameters
Light and nutrients
Substrate type: any. Propagation: runners.
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 freshwater habitats across the Americas, from the eastern United States south through Central America to South America. The species (Sagittaria subulata) grows in shallow pond margins, slow streams, and tidal flats. The plant forms grass-like rosettes of narrow, flat leaves (5–15 cm tall depending on conditions) and spreads aggressively by runners to form dense mats. In the aquarium trade, dwarf sagittaria is sold as an easy, low-tech foreground to midground carpeting plant. The common name is slightly misleading; under low light or in nutrient-rich conditions, the leaves can reach 15–20 cm, making it more of a midground plant than a true dwarf foreground carpet. The species tolerates brackish conditions up to about 5 ppt salinity, which reflects its natural occurrence in tidal freshwater habitats. This salinity tolerance is unusual among aquarium plants and makes dwarf sagittaria useful in mildly brackish aquaponics systems.
Care notes
One of the easiest carpeting plants for low-tech tanks without CO2. Grows under low to high light, in soft or hard water, pH 6.0-8.0, and tolerates a wide temperature range (18–28°C). Under high light with CO2, the plant stays short (5–8 cm) and carpets rapidly, sending out runners every few days. Under low light without CO2, growth is slower and taller (10–20 cm) but the plant still spreads and eventually fills in the foreground area. This resilience in low-tech conditions is the species' main selling point: it's one of the few plants that can produce a carpet-like foreground without CO2, high light, or nutrient-rich substrate (though all of those help). Plant small portions 3–5 cm apart across the desired area. Rich substrate and root tabs speed up colonization. Once established, the runner network becomes a dense mat that chokes out algae. Trim the top of the carpet with scissors to control height and promote lateral growth. The main drawback is that under low light, the plant grows tall enough to block the view of background plants, requiring more frequent trimming than a true dwarf carpeter. Propagation is automatic via runners. A good first carpeting plant for keepers not ready to invest in CO2.