The yam is not related in any way to the sweet potato. These are herbaceous perennial stem twiners with large tuberous roots, grown for food in tropical areas, some winter-hardy with protection as far READ MORE http://www.plant-care.com/dioscorea-i228.html
Stinging nettle is a rampant grower, especially in moister areas; however, no site is immune. It spreads by seeds and underground stems, which also cause pain if you touch them. If any part of the und READ MORE http://www.preen.com/articles/stinging-nettle-earns-name