You can see the 10 ft. ladder in the right corner for comparison. Tallest plants in the far back are tidalmarsh X giant amaranth crosses. Those plants are about 20-21 feet tall. Hard to get a good picture of them because they have a very narrow growth habit. The plants in the front are a mix of pure giant amaranth and self-sown tidalmarsh X giant amaranth crosses. The red amaranth in the background on the far left is a sterile A. hybridus X giant amaranth cross.