Hi everyone. Hope someone can help me. I planted two catawba grape plants last year and they did great. This year one started leafing out and is growing great guns. The other one didn't come back, I thought it had died, but it now has a sucker growing out below the graft. Should I just pull the plant or will the sucker eventually produce anything? We live in the high desert at 4200 feet of elevation. Had a pretty cold winter. Any suggestions on cold hardy eating grapes?