What USDA Zone are you in? That will dictate what plants grow well.
https://planthardiness.ars.usda.gov/PHZMWeb/
bougainvillea is a good choice. The thorns are big and brittle so bits break off in you.
The ancient Greeks and Romans planted cactus and other spiny plants under windows. This deterred thieves and other would be intruders from just going through an open window. Glass was a luxury, so windows were holes in the walls that allowed sunlight during the day, and ventilation at night. When I first heard of this practice, I was amazed at the ingenuity of using thorny plants as decoration and security.
Bokor i think is the word, like Haitian voodoo witch doctors and their African progenitors, grow psychedelic vines around their homes so people creeping on them start tripping. Look into the Bokor
Cool
Stinging nettle
i have experence with this plant from stealth camping in southern california. it is as though you have bed bug bites. the itching goes away and comes back. tiny little hollow needles carry some itchy-histamine stuff.
if walked through a large patch then the next couple weeks they will deal with a lot of itching and lose sleep, will have to apply ointments but it wont stop it.
the leaves are edible(pretty sure)
I walk through them, feel the sting, then forget about it.
You need to do more drugs maybe.
you use drugs because you lack intrinsic ability and dont seem to care
i thought i had bed bugs for a few weeks thats what i said.
less drugs is better
You have to burn the spines off and can boil the shit out of them for tea. Stalks are a good source of moisture.
what do you mean moisture? water is a good source of moisture. i dont follow your language would you explain more.
Blackberry.
I grow blackberry plants. A minor hazard, but a delicious one. I also have holly trees. Nobody gonna climb through such plants.
Came here to say that. Where I grew up they could be six feet or more in height. Nothing gets through that.
As long as you or anyone you cared about never so much as grazed it, the dendrocnide moroides or "Gympie-gympie" would show no mercy
Metal Pineapples work.
Regular pineapple plants do too. Especially giant white variety.. the leaves have huge thorns everywhere.
But to answer the OP, bogonvilla (sp?) obviously. Grows anywhere. And pretty.
how about aggressive plants? seedbomb the ghettoes!
There were some clinging little fuckers that completely destroyed a pair of socks and stuck them to my shoes and pants like you wouldn't believe. I'll stomp through all kinds of cacti and thorns, but those things stopped me in my tracks and fucked up my whole day.
Where are you located? Geography and climate makes a huge difference.
If you are in the California area I would highly recommend poison oak with California wild rose and yucca mixed in. The poison oak appears to only affect humans poorly. Birds love the berries and herbivores like the leaves. The California rose grows like a vine and is thorny as shit. The yucca is sharp enough to stab right through jeans without any resistance at all. Various cholla are great too, as they're like cactus except the spines are barbed, which makes them painful to remove.
The northeast region
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