Being an amateur gardener, I pretty much had no idea when to harvest the stuff in my garden this year. Similarly, there's stuff that I had no idea even how to harvest. Case in point are the giant sunflowers I managed to help thrive over the past few months. I actually grew these from seeds!
If you have sunflowers in your garden that are drooping over like the one above and you're in the same boat as I am, you need to go to THIS site right now. They have all the answers.