Hi stoner..

I wouldn't use the weed KILLER..
Yes, 30 plants can be smelled at 300meters... but... you will probably pull it off.. unless they kow the smell of weed... then there is a risk... small risk...

DOn't disturb the plants or harvest them when there are people around.. That's when plants really begin to smell

It seems like it is gonna be difficult to harvest 30 plants outdoors in the location you described.


good luck