▁ ▁Se eds ▁germ inate ▁in ▁early ▁spring , ▁but ▁plants ▁may ▁continue ▁to ▁emer ge ▁if ▁conditions ▁are ▁favor able . ▁Se eds ▁can ▁be ▁dispers ed ▁by ▁number ▁of ▁agents ▁including ▁humans , ▁animals , ▁machines , ▁and ▁flo od ▁waters . ▁ ▁Distribution ▁and ▁habitat ▁ ▁Hum ulus ▁jap onic us ▁origin ates ▁in ▁temper ate ▁regions ▁of ▁Asia ▁and ▁the ▁Trop ics ▁of ▁Vietnam , ▁but ▁has ▁become ▁an ▁invas ive ▁species ▁in ▁North ▁America ▁since ▁it ▁was ▁imported ▁in ▁the ▁ 1 8 0 0 s . ▁ ▁The ▁plant ▁has ▁been ▁imm ens ely ▁successful ▁in ▁North ▁America , ▁where ▁it ▁has ▁an ▁enorm ous ▁range . ▁It ▁can ▁be ▁found ▁throughout ▁eastern ▁Canada ▁and ▁the ▁eastern ▁half ▁of ▁the ▁United ▁States . ▁In ▁the ▁United ▁States ▁Hum ulus ▁jap onic us ▁has ▁a ▁later al ▁range ▁from ▁North ▁Dak ota ▁to ▁Maine ▁and ▁a ▁vertical ▁range ▁from ▁Minnesota ▁to ▁Georgia . ▁Japanese ▁h ops ▁grow ▁well ▁given ▁pl ent iful ▁sun light , ▁mo ist ure , ▁and ▁nut ri ent ▁rich ▁soil , ▁and ▁are ▁most ▁commonly ▁found ▁along ▁stream ▁banks ▁and ▁flo od pla ins . ▁Japanese ▁h ops ▁do ▁not ▁grow ▁as ▁well ▁in ▁sh aded ▁areas ▁and ▁d rier ▁so ils . ▁In ▁mil der ▁clim ates , ▁it ▁can ▁surv ive ▁the ▁winter . ▁ ▁E colog ical ▁threat ▁ ▁The ▁Japanese ▁hop ▁can ▁adapt ▁well ▁to ▁new ▁environments . ▁Its ▁range ▁and ▁distribution ▁in ▁North ▁America ▁prove ▁that ▁it ▁can