I have a vacant plot, not very big, in which I wish to grow vegetables. The problem is that although I have dug the plot for a number of years I keep getting roots with fibrous threads. Although I try to get these up they go deep. My neighbour has a Cyprus hedge about 2 ft away and there is an Ash tree about 6yds away. Could this be the cause of the problem. Any advise welcome. I am 70 and cannot undertake lots of hard work on this plot.