I have 10 leyland cypress trees we planted for a client 2 years ago. There were 3 gallon size, about 4' tall at the time. They are now about 7-8' tall with thick limbs. This winter, the trees started leaning and falling over towards the ground. When I say lean, I mean the trunk is staying straight, pushing the dirt over and leaning the whole tree. The trees are not bending at an angle on the trunk. The trees do not have mulch piled against them, but are in a bed of mulch, so this may be keeping the ground a little wet. I have tried staking them with the short plastic stakes I usually use, but this hasn't worked very well. This is in SC where we have had a good amount of wind and rain this winter, but not an extreme amount. I'm guessing that the trees are just at an in-between point where they are very heavy, but not strong enough to support themselves and that the wet ground and wind are too much for the strength of the trunk at this point. Would you recommend getting some sort of long (10-12 inches?) metal stake to drive in the ground, or would you even go to the extreme of driving some sort of 8 foot post into the ground beside the tree to strap the tree to? I need to get this fixed this weekend for a customer and would appreciate any input.