Posted: 15/05/2012 at 16:16
I agree with the comments about stripping the grass from the base of the lilac tree, and Flowerchild's other comments on how to treat it. As for feeding, I think that you can try feeding it with more or less anything, as it will be better than nothing.
Suckers - yes, you can certainly dig them up and grow them on into new plants. Here's a step by step guide: