Question: How do I get bittersweet nightshade out of my pasture and how harmful is it to animals? Answer: Jonathan Foster, Home Horticulture Outreach Professional Bittersweet/climbing nightshade (Solanum dulcamara) is toxic to wildlife, as you obviously know. The lengthy species page from the USDA and the US Forestry Service says:”Climbing nightshade contains solanine (glycoalkaloid and alkamines collectively), a read more How do I get bittersweet nightshade out of my pasture and how harmful is it to animals?