Wildlife hedge question
I planted some wildlife hedge whips - mainly hawthorn, blackthorn and possibly some rosa rugosa - a few years ago. Due to my poor pruning, the hedge is more like a collection of saplings with fairly sparse leaf cover than the thick hedge I was looking for. If I cut the sapling trunks down to ground level, will they generate new growth from the bottom or will I just be killing the plants if I do this? Thanks.