I hope that it could be general statement, but I do not know if it is general statement. I calculate that earth gravitation is 360 kg. To going up we have to add weight of body to 360 kg, and minnimal string have to be (360 + x)+ min. ok. 1 kg. We could use for it Newton.
x- weight of body
My theory is better becaouse Newton theory of gravitation imply from contrifugal force, and in my opinion rottion of plants imply from his polarity.