AIBU to want to punish teenagers that are not mine?

[FlossyMooToo]

I am very angry.
So angry I am posting here instead of going to 3 teenagers homes and screaming at them and their parents.

School hols and responsible 13 yo is at home while I am at work. He knows the rules and is a good kid.
He did his first day on a milk round this morning and was up at 2:30am so wanted to spend the day napping.
His 3 "friends" came round to call for him. He told them through the letter box he was tired and not coming out.
They kept nagging him so he ignored them and went upstairs.
I have come home from work to find the flowers I had planted and spent £280 on over the weekend (back garden) have had all the heads knocked off with a stick.

My son was not aware they had done this.
I am too angry to be rational so posting here till I calm down.

When did teenagers lose all respect?

I appreciate this is a first world problem and they are only flowers but it was alot of money to me and I just wanted a nice space for me and 4 DC.

Update

I have managed to find out it was apparently 1 boy. Same boy was asked to leave another friends garden last week for hitting their fence with a stick.

Quick chat with ex to find he has also banned this boy from calling for our son. I knew about this but thought it was a different boy, very similar name.

So I have decided to call round to his parents tomorrow.
I am going to explain the situation and also that I am not accusing their son as I dont actually know but in light of the damage done he will not be welcome at my home.
Same as the other boys.
Any further destruction to my property and I will contact the police.

Apparently his parents are not the type to give a shit. However I will try. Seems the lad has no chance if mummy and daddy are scumbags.

Good luck Op

Thanks Roz i just hope I am calmer tomorrow.
I want to be as reasonable as possible in the hope they listen dont glass me but I am still fuming.
I was so proud of how bright it looked and how much work i put in. Now it just looks sad and battered.

So this 1 boy has already been banned by your ex and another parent in the last week or two? He sounds a bit like a troubled kid on the cusp of getting into deeper shit.

If I was you I'd also talk to the parents of the other boys. At this age peer pressure has far more effect than parental disapproval. If all the other kids know there will be hell to pay from their own folks if Troubled Boy pulls a similar stunt then they may be able to either withdraw from him or limit his antisocial behaviour.

I have spoken to 1 of the parents and will speak to the other 2 tomorrow.

My son is so upset and worried troubled boy will be out to get him if I speak to his parents. He has only just told me where he lives and i am not looking forward to going but I as a parent would want to know so I am hoping they will too. I doubt it though the more I hear about them.