Thick roots under gravel in garden - Advice please.
Sorry, but not sure if this sort of issue is for Gardeners' World but don't know who to ask (please tell me if anyone knows who I can get advice from). I have recently bought a house and discovered thick roots under the gravel stones, very close to the surface, in the garden (they are just after the awful circular paving towards the bottom). We own the 1st medium shrub to the right & the rest is growing from the car park area next through our fence, owned by the residential management company & they have a hedgerow not far from the back of our fence (can just see the top on the photo but not sure what type it is) & there are trees fairly close by as you can see (not sure what type). They said it would be too difficult to know where they are coming from so not their responsibility. My question is, can roots (about 2.5 cm thick) grow from shrubs this size? My guess is they are from the trees to the back of the property or the hedge but not sure what type and have no photos, but can see the top of them both from the photo. I plan to get rid of the gravel and pave the area but one part of them is really protruding. Can I just pave over the top of them (if I can flatten them down) or should I just saw them off (don't want to kill any tree). Is it possible to know from the root where it can be coming from? (may be a silly question) Thank you for any help you can give.