Blackberry is evil.

If it is not native to your country don't plant it! Nothing eats it, grows extremely quickly and is very hard to get rid of.

Blackberries grow in thick brambles with nasty thorns. It also has a hardy root system that allows it to regrow if you just cut it down. They also spread a few feet per year, so keeping them contained is a constant (and often painful) battle. If you go too long without paying attention to it, your entire yard will be a mess of thorny brambles that are nearly impossible to kill.

They grow as brambles and grow thick.

It will take up any and all space it can.

You won’t have to worry about kids playing in your yard, but they’ll be in it for berries

Make sure to try to find a thornless variety. Blackberry thorns will wreak havoc on your body and your clothes

The bramble types do. They'll spread out a few feet every year and new plants will pop up everywhere. They're hard to prune because of the nasty thorns, and as long as there's roots, they'll grow back.

You can get a thornless variety that's much easier to contain. I have one in my front yard that hasn't spread at all.

Extremely hardy, hard to kill, and spiders love them. But the fruit is delicious!

yes, and they have sharp thorns, makes removal them very difficult. apparently is the himlayin blackberry is the notirous hard to kill weed.

the himalyin blackberry is capable of regenerating from root fragments, even if you pull out the whole plant, a small part of it can regenerate.

Well, good news!

You'll certainly have a lot of blackberries if you plant them.

The bushes down near the river by me are about 20 feet thick and 8 feet high. The only other thing growing near them are nettles. It's a genuinely fearsome plant.

Are you in the US? There are a couple of native blackberries that don't grow in brambles, but they are still quite pokey. This one basically grows as a couple of arching canes, usually on a tree line with a few others.

They are evil incarnate