My young eucalyptus tree, planted at a height of 5 ft' 8 months ago, was staked but the ties became too tight and the tree is now approx. 10 ft, so I thought it could stand up on its own. However, when I removed the ties it doubled over so that the top is now touching the ground [it is completely firm and stable at the base]. My previous eucalyptus grew straight up without any stakes. Why has this happened and what can I do?