Not to be semantically confused with : Mouse-Ear-Hawkweed (Pillosella officinarum) [a low yellow-flowered plant with similar name belonging to the Asteraceae family]. Nor with Mousetail (Myosurus minimus) which looks like a plantain (but isn't) nor with Mouse-plant (Arisarum proboscideum) an Arum Family plant.

Hybridizes with : the similar-looking garden plant Snow-in-Summer (Cerastium tomentosum), the result being intermediate in hairiness (Snow-in-Summer being densely hairy, more so than Field Mouse-ear). It may be found near both parents but is likely to spread away from its parents.

Some similarities to : the taller 15-60cm high Greater Stitchwort (Stellaria holostea) in that it also has large and cleft white flowers 10 long stamens but with only 3 styles (and not with the 5 styles of Field Moise-ear). Greater Stitchwort is less sprawling and has a more upright stance, with longer leaves.

It grows from creeping underground rhizomes in dry limey grasslands often with bare patches, on verges or on the margins of arable land, or on dry sandy soils such as sand-dunes and sand-pits. Most often found near the coast on the Eastern side of the UK, but also on the Sefton and Fylde coasts in the west.