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A field study on the growth and yield characteristics of African nightshades was conducted at Kisii Agricultural Training Center for two seasons in 2006/2007. The three species studied were Solanum villosum Miller, S. americanum Miller and S. scabrum Miller. The experiment was carried out under randomized complete block design (RCBD) with three replications. Of the three species tested, S. villosum was the tallest in both seasons by between 34% and 58.7% compared to S. americanum and S. scabrum. The internode lengths of both S. scabrum and S. americanum were also shorter compared to that of S. villosum. The edible yield of the African nightshade species was seasonal, with S. americanum giving the highest yield of 4.12t/ha in season 1, but the lowest yield of 2.31t/ha in season 2. S. americanum with the highest yield during rainy season (Season 1) coupled with average height and branching ability would be preferred for vegetable production, especially where rainfall is above 1200mm per annum

Variations in growth and yield characteristics of three black nightshade species grown under high altitude conditions