Yup... I forgot to mention my grow isn't your ordinary walk in the park. It is some 45 miles away and about a 6 mile hike threw the wood .So when I make a trip I want it to count as far as the mice screw them they have cost me more work that i care for .
You're poisoning wild land? DUUUUUUUDDDEEEEE NOOOOOOO!!!! You're in THEIR home man!!! If you were defending your own land against pests then sure go for it. But then use SELECTIVE methods like the bucket-and-antifreeze one stated below (look, a pest is a pest no tears for them in the end) but try to make sure you get ONLY the pest in question.
But you're on their turf dude. I know we're not all hippies around here, but in the circles I move your method would've earned you a few smacks upside the head area.
No amount of pest-control will help you. Welcome to Guerilla Growing my friend. And I am going to point out to you at this point that a good guerilla grower knows what pests to expect for his patch, and prepares for it. Mice are a guerilla grower's worst, absolute worst, enemy. After that you get rabbits, hedgehogs, deer, etc.
Mad Hamish's Guerilla Rule No1 : NEVER KEEP ALL YOUR EGGS IN ONE BASKET. A single patch is no guarantee for a crop. You'll make yourself go grey with worry before your time this way, single patches.
Mad Hamish's Guerilla Rule No2: YOU CANNOT MASTER NATURE. You can roll with it only.
Mad Hamish's Growing Rule no1: Apply the principle of Occam's Razor: "All things being equal, the simplest solution is usually the most effective"
So my advice is prepare more patches next time. Your mice are NOT going to stop being a problem so prepare for that well in advance. You can poison as much as you want, it will make NO difference.
What is simpler, trying to exert control over an eco-system, or protecting the stem of a plant with a near instantly made collar?
Last bit of advice before I unsubscribe from this thread: Whatever you use, galvanized pipe, cheap pots, make sure to paint the things a nice olive green or whatever suits the colour of the earth around, olive green is excellent because at worst it looks like a shadow.
I know it's pissing you off man. I lost an entire crop to mice, and I'm talking NYC Diesel and Black Widow TREES of 2.5 to 3 metres each. On a big plant they start stripping the harder tougher bark off for buildong nests or whatever, and chew so deeply into the stem that a plant can topple. Of not that, they take care of it branch-by-branch for the water, going higher and higher up the plant only to gnaw off a single branch at the stem in order to drink the sweet fluids.
IF some do survive after that, they'll go at the buds, gnawing them open and destroying them for the few seeds, they are ADDICTS for weed seeds.
Best of luck.