First Sungold on my balcony

Growing tomatoes on a balcony in a pot is a challenge, especially if the conditions are suboptimal. Total direct sun for my balcony is around 4-5 hours per day. Hence, with these limitations, it would only be cherry tomatoes, and I've chosen Sungold, my favorite. The first ones ripening are presented below. I have them in a 15 gallon container.