The National Sunflower Association works with commercially-produced (agricultural) sunflower grown by farmers for food, oil, and industrial purposes. Gardeners and consumers seeking information on growing ornamental sunflowers should consult with a local horticulturalist or gardening expert; a local plant nursery or nearest county extension office is a good place to start. To locate county extension offices in the U.S., see the web site:
http://npic.orst.edu/pest/countyext.htm
Other online sources of information on growing ornamental sunflower:
www.sunflowerselections.com/
www.gardenweb.com/
www.thegardenhelper.com/
www.gardenguides.com/
www.seedsense.co.uk/
www.nuflowersllc.com/
www.nationwidemortgages.net/home-garden-improvements.html
http://www.talktotucker.com/resources/guide-to-gardening-at-home/
alansfactoryoutlet.com
www.angieslist.com/articles/beginning-home-gardening-guide.htm
dragonfiretools.com/the-beginners-guide-to-gardening-tools/
gardeningmentor.com/plant-vegetable-garden/
www.fragrancex.com/fragrance-information/a-home-gardening-guide-for-the-family.html
https://porch.com/advice/backyard-butterfly-garden
https://www.gardendesign.com/flowers/sunflowers.htm