I have a 40 year old grape vine in a conservatory that I have been maintaining for many years. It is rooted externally and i don't feed it or water it. In recent years crops of fruit have been quite small compared to prior years. I wonder if a new vegetable patch behind the conservatory may have taken some of its root area. There are concrete paths all around the conservatory and earth pits inside where it is planted. Should I feed or water it?
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