i had 7 guerrilla spots in corn this year and this is what i used and learned from it.
im from Denmark at 56 northern latitude
i used early, potent and mold resistant genetics
its important that the genetics are early, or at least early enough to finish in the corn
here the corn is started at mid may but due to pesticide use i cant put my mj's out until mid June.
start them inside and then grow them outside in pots in your own garden until mid June.
when planting them out its best to do it in the dark and use a head mounted lamp
water them with water with a nutrients to help them get started
also spray some slow releasing fertilizer pellets around the plants to help nutrient release over time
in Denmark they harvest the corn from start to mid October so i harvest end of September to be sure.
corn is a perfect way to do guerrilla farming
the soil is good and its well hidden.
this pix isnt mine though