Multipart process...much like eliminating Oxalis pes-caprae. Remove as much of the tuber mass as possible. In one yard with sandy soil, I actually sifted the soil to remove smaller bulbs of Oxalis. Exhaust the tubers. Mow/weed leaves, Apply herbicide to fresh growing leaves/cut stems...maybe something works on Pinellia. Water and fertilize at the beginning of the growth period, then cover with black plastic: no light for phtosynthesis, and possible cooking on sunny days, keep watered and fertilized to encourage growth in the dark. Eventually can revert to eternal vigilance whenever a leaf shows. Robert On Tue, May 11, 2021 at 9:24 AM Robert Lauf via pbs < pbs@lists.pacificbulbsociety.net> wrote: > Some years ago, I was hybridizing Pinellia tripartita and bought a > presumed natural hybrid, Pinellia 'Polly Spout, which was billed as sterile > so it doesn't volunteer. Tragically, my plant failed to read the marketing > literature and has now taken over part of my yard and clearly intends to > take over the neighborhood. It seems to be impervious to multiple > applications of Roundup. I called the Air National Guard to see if I could > request an air strike with some Agent Orange, but they balked (OK that was > a joke). Digging is a fool's errand because bulblets can break off and pop > up later. > If anyone knows how to eradicate this horrible weed, I'm all ears. > Bob E Tenn > _______________________________________________ > pbs mailing list > pbs@lists.pacificbulbsociety.net > http://lists.pacificbulbsociety.net/cgi-bin/… > Unsubscribe: <mailto:pbs-unsubscribe@lists.pacificbulbsociety.net> > _______________________________________________ pbs mailing list pbs@lists.pacificbulbsociety.net http://lists.pacificbulbsociety.net/cgi-bin/… Unsubscribe: <mailto:pbs-unsubscribe@lists.pacificbulbsociety.net>