Moths & butterflies known to feed on soft rush (Juncus effusus):

Species Status Match
Light knot
Acronicta menyanthidis
LC this species
Small rufous
Coenobia rufa
LC this species
Gold spot
Plusia festucae
LC any Juncus species
Red sword-grass
Xylena vetusta
LC this species

Host-plant data: Cook et al. (2025), Traits data for the butterflies and macro-moths of Great Britain and Ireland, 2024, UK Centre for Ecology & Hydrology / Butterfly Conservation; and Padovani et al. (2020), Database of Insects and their Food Plants (DBIF), UK Centre for Ecology & Hydrology (both Open Government Licence). Contains data supplied by UK Centre for Ecology & Hydrology.