Nettles New nettles October 14, 2018 Stephen Barstow Leave a comment Two new nettles in the garden this year but neither have shown any signs of flowering.. Annual, Northern Asia nettle from Ussuri in Russia and Korea… Girardinia septentrionalis Mallorca nettle (Urtica bianorii syn. Urtica atrovirens subsp. bianorii) is perennial but unlikely to be hardy…