>>2579345this, 100%
that's what happened on my land, W clear cut it in like 2008, then replanted. by the time we bought it in 2019 it had a ton of 20' foot trees, but every clearing was completely infested with blackberries, and the foot every tree has canes climbing up the branches.
when a forest is logged, there's enough light at ground level, and invasive shit takes over. it takes a few years for the trees to get tall enough after reprod to block out enough light .. but after this, at least once you clear the understory it doesn't grow back.
i like blackberries just fine, but they're cockblocking my morel's, and i'm not okay with this.