[7] The leaves grow alternately and are either sessile or shortly petiolate on the stems, and have prominent blunt teeth on the edges.

[7] The interior of the flower is yellowish with the reproductive column being purplish at its tip, and the petals often having purple veins to varying extents.

[6][11][2] Lobelia angulata has now become quite widespread in the British Isles, especially in areas of England and Scotland, with sightings increasing since the turn of the 21st century.

[12][10] Lobelia angulata grows in a variety of moist habitats from lowland to 1,300 metres above sea level in the low alpine zone.

[5][10] In New Zealand, flowering first commences in late spring around October and lasts until early autumn, typically March and April.

[14] Lobelia angulata is a perennial plant, and thus lives longer than one year or season, and also has a fast rate of growth.

[13] Since this plant roots at the leaf nodes, it could also propagate in new areas via stem fragments that wash away or are carried to new locations.

[15] Dipterans known to visit its flowers include the Syrphid hoverfly Melangyna novaezelandiae and Tachinid flies such as Heteria plebeia, Gracilicera politiventris, Procissio cana and species in the genera Occisor and Protohystricia.

[15] Wellington Tree Weta (Hemideina crassidens) feed on the fruits and excrete the seeds intact in their droppings.

[6][15] The alpine Acridid grasshoppers Sigaus australis, Paprides nitidus and Brachaspis nivalis are also known to feed on the leaves, as well as the flowers and fruits.

[19] Lobelia angulata has become a popular plant in cultivation, especially due to its attractive whitish flowers and reddish fruits.

[9][6] This is the reason why L. angulata was initially brought to the United Kingdom (UK), before then spreading throughout many regions of the British Isles.

[6][13] Māori people of the Tuhoe tribe in the Urewera district of the North Island were known to gather the tiny leaves of Lobelia angulata, cook them and eat them as greens.