Posted: 28/02/2014 at 13:04
Chaenomeles may be pruned to keep it within bounds. We have a lovely one which is tied in to a trellis and thought it is 6 feet tall, it is no more than 2 inches wide at any point. Don't get much fruit on it, but it does flower well.
Vranja is prone to suckering as well, by the way. BUT I cannot see any reason for it to damage your wall as the roots are fairly shallow and not that spreading. There are no roots coming from our Queeches Prolific Quince tree under the lawn near to it.