help

I have woods by my house and they're big I was wondering in springtime it would be good to plant a seed on spring but 1 other question is there's always helicopters that fly by my house in the dark in the evening would they notice 1 plant

I doubt very seriously they would even see one plant, but if you do plant in the woods, anticipate how the sun is going to move and change 3 months later so you're not left with no sun by the time you get close to finishing.
Tree foliage will increase, and block some sun also.
Also keep in mind, you will have to carry all your stuff in (water is usually the heaviest) so don't go 50 miles away.

I highly doubt they would see them, and if your gonna plant in the woods, make sure its in a VERY sunny spot.

they wont see 1 plant in the middle of the woods.