Black Nightshade

Depending on conditions and climate, black nightshade may be annual or a short-lived (2-3 years) perennial of about 80cm in height. A member of the potato and tomato family, it competes vigorously for space and nutrients. It is also known to be a host to numerous nematodes, fungi and viruses that indirectly threaten associated crops. Its green (immature) fruit and leaves may at times contain toxic alkaloids.

The berries ripen to dark purple, almost black, and contain multiple seeds, the most common method of spread. Control of young plants, before they flower and set fruits, is essential. Roundup Gel is most effective, especially when plants occur among desirable plants in the garden or vegetable patch. For other areas where spraying or practical or where there are multiple plants, Roundup Fast Action Ready-to-Use Weedkiller will give effective control.