[1] L. effusum occupies a hygrophilous ecological niche along with other Lepidosperma species; L.australe, L. longitudinale, L. gladiatum , L. quadrangulatum, L. striatum and L.

[3] It has numerous ecological associations including Quokkas who use it as a protective habitat, the Noisy scrub-bird, Australasian bittern and the Red-winged fairy-wren who makes nests from the leaves.

The rare Main's assassin spider Zephyrarchaea mainae is restricted to litter lodged in the crown of L. gladiatum and L.

[3] Lepidosperma effusum is sold commercially and can be grown in a full or part sun position and will tolerate a light frost.

They form dense stands along foreshores or around wetlands that trap soil and water run-off, which in turn limits the transfer of nutrients into waterbodies.