Veronica arvensis (common names: wall speedwell,<ref name= "Stace">Template:Cite book</ref>Template:Rp corn speedwell, common speedwell, rock speedwell<ref>Veronica arvensis at USDA PLANTS Database</ref>), field speedwell<ref> Popay I., Champion P. & James T. (2010). An Illustrated Guide to Common Weeds of New Zealand, Third edition. p. 286. New Zealand Plant Protection Society (Inc.), Christchurch, New Zealand. Template:ISBN.</ref> is an annual flowering plant in the plantain family Plantaginaceae. The species is a native European plant and a common weed in gardens, pastures, waste places and cultivated land.<ref name= "Stace"/>
It is a hairy, erect to almost recumbent, annual herb, Template:Convert high from a taproot. The leaves are oppositely arranged in pairs about the stem. The lower leaves have short petioles; the upper are sessile. Each leaf, Template:Convert in length, is ovate, or triangular with a truncated or slightly cordate base, with coarse teeth. Borne in a raceme, initially compact but elongating with age, the flowers are pale blue to blue-violet, 2 to 3 mm in diameter, four-lobed with a narrow lowest lobe. Flower stalks are Template:Convert and shorter than the bracts. The fruit capsules are heart-shaped and shorter than the sepal-teeth. It flowers from April to October.<ref name="Stace"/>
V. arvensis plants go through changes in their germination<ref>Template:Cite journal</ref> due to temperature and light, furthermore explaining what controls the timing of growth in buried seed reserves. These weeds tend to germinate in consistent temperature ranges of 10 degrees Celsius to 15 degrees Celsius. If they do not make the first autumn cycle of growth, they can grow in the following spring. Overall, light is a major source to their survival and growth. In other words, they can grow in darkness, however they will remain dormant unless they get light.