How much can one plant produce

You know...that's a good question. Considering that mj is a semi-hardwood in the correct enviroment the plant could out live a human being. I know that every snip I take can have a potential of 4oz's.

depending on your strain, location and technique, your plant could produce anywhere between 15 grams of fluffy, unsmokable crap that you can only make hash from, or over a kilo of dense, dank buds...

Have you ph balanced the soil you intend to use?

50 bucks....damn. uhh get a PH control kit, and maybe some fox farm ferts if nothing else.

and yield of your plant will vary for many reasons. keep it healthy and grow it big as you want. the bigger, the healthier, the more and better the outcome

Locate near young hardwood trees for various reasons.

I don't know your growing season where you live but if its short your gonna want an early strain. You mentioned slugs, they'll eat your plants as fast as you plantem unless you put a dish of beer right by your plants. They'll drink themselfs to death instead of ruining your crop. The spiders on the other hand can be your best friends by eating all opposing threats to your girls. A healthy plant can produce anywhere from a couple ounces to a couple pounds dry depending on the environment, strain and lifespan. My uncle claims to have seen thirty foot trees in vietnam. I've also seen plants that only produce one bud and where a few inches high when my dumbass friend planted some swazzi (thats what his dealer was claiming it to be) bagseed in hardpack native soil under heavy overgrowth.