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Tagetes argentina
''Tagetes argentina'' South American species of plants in the sunflower family.〔(Tropicos, ''Tagetes argentina'' Cabrera )〕 It is found in Argentina and Bolivia on granitic and rhyolitic soils.〔Jørgensen, P. M., M. H. Nee & S. G. Beck. (eds.) 2014. Cat. Pl. Vasc. Bolivia, Catálogo de las plantas vasculares de Bolivia, Monographs in systematic botany from the Missouri Botanical Garden 127(1–2): i–viii, 1–1744.〕〔Zuloaga, F. O., O. Morrone, M. J. Belgrano, C. Marticorena & E. Marchesi. (eds.) 2008. Catálogo de las plantas vasculares del Cono Sur. Monographs in Systematic Botany from the Missouri Botanical Garden 107(1–3): i–xcvi, 1–3348. 〕
''Tagetes argentina'' is an annual herb up to 30 cm tall. The foliage is generally dense, formed of pale green leaves which are narrowly pinnately dissected. The flower heads are white, and, although each head is 5 to 6 mm across, 5 to 25 heads together form showy flat-topped clusters. These clusters are on short peduncles which barely exceed the foliage, and since many branches often bloom at once, the entire plant is generally covered in a blaze of white. Achenes directly sown after the last frost grow to flowering in 8 to 12 weeks, and continue until killing frost. The mounding form is encouraged by early pinching of the young plants. The plants tend to naturally form low mounding shrubs to 30 cm tall. The foliage is generally dense, formed of pale green leaves which are narrowly pinnately dissected.〔Cabrera, Angel Lulio 1937. Notas del Museo de la Plata, Botánica 2: 187, figure 6, plate 3. 〕
''Tagetes argentina'' responds well to garden soils from acid to neutral. Sandy soils are preferred, but plants did tolerably well in the clay soils of central Texas. In conditions of full sunlight, rich soil, and ample moisture, it forms a compact, rounded plant. Flowering tapered off in the mid-summer as temperatures rose above , but resumed with cooler weather.
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