First off, be specific. If you're growing beets, write what specific variety. Second, Include how many days you're garden has been going on, and add the date of each entry. Take pictures, no matter where you are going to put them. Pictures help you to see how your garden has progressed over time. If you want to do something with your journal that you think would be better, go for it. Remember this is your project! Lastly, don't just record the successes. The failures are part of your garden too. Record everything that happens.