Except for the invasives, notably barberry and multiflora rose in my part of the country. Those suckers have been out for weeks. Barberry (whose Latin name, Berberis vulgaris, is wonderfully apt) isn't particularly nasty. It's a deciduous bush with bitter berries that happen to be high in vitamin C. It crowds out native species, but at least it doesn't have thorns. Multiflora rose is a different story. Its recurved thorns make it the plant equivalent of barbed wire. Part of the reason it was introduced here was because it makes such a good hedge. It has claimed any number of my shirts and pants over the years. If you hack at it with a machete, it just flexes and bounces back. You're better off with a hand pruner if you ever find yourself walled in. Which can happen when the madness of shed hunting is particularly strong.