I don't remember if I posted this last summer and I'm too lazy to look so I'm sorry if this is a duplicate.
I do enjoy playing a bit with things that grow outside. I have a few plants that if killed are grounds for a divorce. (Lilac, Bleeding Heart, and some other bush that I can't spell the name of) The one thing that I hate and I'm sure everyone hates is taking a wander out in the lawn barefoot to enjoy the feel of grass on your toes and then you step on a thistle. I freakin hate that and they always seem to grow in any conditions. Well my friends, I have found a cheap, earth friendly way to kill these little bastards.
Plain ol' 50 cent salt.
Iodinated or regular, it doesn't matter. Just pour some on the leaves and let it sit. Within a couple of days the plant absorbs the salt and it kills it from the roots up. It'll turn black and wilt and be able to be disposed of.
Just a little green thumb tip that I'm sure many know of but I find amazing every year.