I've been growing giant plants for over 25 years in New Jersey These pictures are from my 2022 garden. I mainly grow sunflowers, amaranth, and corn. My garden is approximately 90 feet x 40 feef

Here are measurements of some of the tallest plants
2022 Garden
Giant amaranth
23'3" male (clone) 22 1/2" circumference
22'9" male (clone)
22'5 1/2" male (clone)
22'4"male (clone)

Corn
17'8" Uchima Grande
16'10" Uchima Grande
16'0"
15'2 1/2" Uchima Grande w/ear-no seed
15'1"
14'11 1/2" Uchima Grande w/ear-no seed
14'8"

Sunflower
18'2" USDA wild original seed
16'7" Multi-headed sunflower
16'1" Multi-headed sunflower
15'7" Multi-headed sunflower
15'6" Wild, 2020 saved seed
15'5" Wild sunflower
15'5" Wild USDA original seed
15'5" Multi-headed sunflower
15'2" self sown wild - driveway
14'11" Multi-headed sunflower
14'10" similar 389 flower
14'10" wild, 2020 saved seed
14'6 1/2" Multi-headed sunflower
14'2" Multi-headed sunflower
14'8 1/2" Multi-headed sunflower
14'0 1/2" Multi-headed sunflower
13'10" Multi-headed sunflower
13'8" Multi-headed sunflower
13'7 1/2" Wild, 2020 saved seed
13'6" Multi-headed sunflower
13'5" Multi-headed sunflower
13'3" wild sunflower
13'2" Multi-headed sunflower