I have a client who wants to make a sunflower maze for agri entertainment purposes. He wants to know what variety he should plant, what spacing, when to plant and at what point would the sunflowers be tall enough to form a maze, i.e. hide children walking through it.
Shelby County Kentucky
There is not a lot of university information on sunflower mazes. The private mazes (which are mostly what I found using Google) do not provide any information on varieties, etc. II would suggest contacting some of these farms directly; if your client is not in the same state, they should have no problems sharing information with you.
Off the top of my head, you will want to have sunflowers that reach a minimum of 5 to 6 feet tall. You will want to avoid the branching "multiflora" types, as those will spread into the walkways. This article from N. Carolina lists some popular ornamental sunflowers, and lists height and other characteristics: http://www.ces.ncsu.edu/fletcher/programs/herbs/crops/agritourism/sunflower_varieties.html
This article from Ohio State doesn't discuss varieties, but it does provide some basic information on planting and management: http://ohioline.osu.edu/agf-fact/0107.html
This article from Arkansas goes into more depth on planting, pest control, and other management: http://www.uaex.edu/Other_Areas/publications/PDF/FSA-2018.pdf . The variety information at the end of the article is about 10 years out of date, but the rest of the information should still be good.
If your client needs more information, please email me directly.