The Thai's tried to tell me that lemon grass worked, until I saw a Cobra curled up in a lemongrass clump.

 

I personally believe nothing works and they repellent companies are preying on clients fears...

Do you know how smelly Neem trees are? I was thinking of planting them along the border, but seems they only really will stop insects on the actual tree itself. Possibly reduce numbers in the immediate area as well. Maybe next rain season I will give it a go, less insects around the borders may mean less frogs and less snakes crossing with any luck. Also may make any wandering ticks change their course. 

Nigh on impossible to keep them, this was a month ago, snake, scorpion, centerpede, who knows but he's gotton over it pretty good.