If you do not wish to watch the video, here is a summary:
If you leave your crops and fence unattended for 7 days, the fence will remove itself and the crops along with it.
You can find the fence in a storage near to where your garden was placed or from where you originally rented the fence.
The crops, however, are lost when the fence is removed. The support team will not be able to restore the crops once this happens.
So please be careful and look for the “Scheduled Removal Time” which can be found in the “Garden” icon under “Garden Information”.
Thank you for your understanding!