Right. An element of proving negligence is that the owner knew or should have known that the hazard existed.
Since that's unlikely, another way is to find witnesses who can attest to the fact that the condition existed for some time and was easily noticeable to anybody passing by. If would also help if you could find somebody who actually notified the owner of the condition prior to your tripping over it.
I have been a liability claim rep in the past so if you want more help feel free to post more details of when (the date) and how this happened.
I hope you photographed the scene and the hazard. If so, you can post a photo here.
Did you report the injury to the owner when it happened or have you since put him on written notice that you are making an injury claim? If yes, with what results to date?
What is the nature of your injury and have you received medical treatment for it?