I found myself looking up plants online and came across a photo of a giant sunflower (we’re talking 12′ tall, yes 12 feet). I bought a bag of Russian Mammoth Sunflower seeds from Amazon and started them. They have been by far the easiest thing to grow so far. I planted 10 seeds and all 10 sprouted. They’ve been gradually increasing in size and are about 1′ tall each right now. I’ve also had to repot them twice because they keep growing. Once they get a bit larger, I’ll transplant them directly into the ground as well.