i recently moved to southern california and bought a condo with a grape vine in the terrace. it grows against the wooden partition that separates my terrace from my neighbor's. my problem is that the vine appears to be dying. about 90% of the leaves have yellowed and fallen off and i don't know why. none of the plants in my front yard or trees in the complex have yellowed. the coldest it gets in southern california is about 50-ish at night. I water the plant once a day. can it be saved?