Can Dwarf Hairgrass and Spatterdock Grow Together?

Dwarf Hairgrass and Spatterdock share a workable water window around 15 to 28 °C, pH 6 to 7.5, and 2 to 15 dGH.

Dwarf Hairgrass is listed for freshwater to lightly brackish water, while Spatterdock is listed for freshwater. Keep the tank in the shared part of those tolerances rather than pushing either plant to an edge.

Flow is workable if the layout gives Dwarf Hairgrass moderate flow and Spatterdock gentle, low-flow water.

Their light and CO2 needs are close enough for one routine: Dwarf Hairgrass does best with moderate light and recommended added CO2, while Spatterdock does best with moderate light and optional added CO2.

They naturally settle into different parts of the scape, which gives you more room to use each species for what it does best instead of forcing direct competition.

Dwarf Hairgrass reaches about 7 cm tall by 15 cm wide, while Spatterdock reaches about 60 cm tall by 30 cm wide. Use those mature sizes for the layout, not the small nursery portions you bring home.

Shade is worth watching, but it is usually manageable through trimming and a little spatial separation.

Dwarf Hairgrass is typically rooted in substrate with nutrient-rich substrate preferred and feeds mainly as a root feeder. Spatterdock is typically bulb / tuber on or partly in substrate with nutrient-rich substrate preferred and feeds mainly as a root feeder. That difference can make the pairing easier to arrange than two plants fighting for the exact same root or attachment zone.

Mature size is not the main thing working against this pairing, so normal maintenance is usually enough to keep the scape readable.

Both plants have moderate growth, moderate maintenance, and intermediate difficulty. That makes the maintenance rhythm predictable: watch for crowding, remove old leaves, and avoid letting one clump shade the other for weeks at a time.

The main watch-out is that the layout needs a little thought so one plant does not slowly dim the other.

The strongest reasons to try the mix are that they share a workable temperature window around 15 to 28 °C; and that their flow preferences sit close enough to tune one layout around both plants.

Use this pairing when you are willing to manage the scape, not when you want a plant-and-forget combination. Start with more spacing than you think you need, then adjust once both plants show their real growth pace.

The simple success test is whether both plants still look healthy after the faster grower has been trimmed several times. If one keeps declining after routine care, the layout is probably asking too much of it.