This is the max recorded size created for my sunflower series in my craft inbox.
The smallest sunflower size in my craft inbox record is down to within 5mm on a Studded Ear Adornment.

Some Facts About Sunflowers

Sunflowers got their scientific name Helianthus from the Greek in two words:
"Helios" - meaning sun, and "Anthos" - meaning flower.

They get their name from a characteristic that their round, golden blossoms often grows by following and facing the moving sun.

Sunflowers date back to ancient times.Carbon dating of seeds found in North American clay date back nearly 3,000 years.

Archeological evidence suggests that sunflowers were cultivated and improved upon as early as 2300 B.C.,possibly predating to the farming of corn, beans, and squash.

Sunflower seeds provided a handy source of nutrition to the indigenous tribes of America, while dyes were extracted from petals and pollen. Pulverized seeds also yielded oil, which was used for cooking and in hair treatments.
Various parts of sunflowers were also involved in traditional medicinal applications and folk medicine has depended on the sunflower for the oil in the seeds for coughs and teas made from stem parts throughout the world .

Additional Interesting Reads On Sunflowers...

• The Sunflower is the birthday flower for June 30.
  It represents - adoration, affection, contancy, false riches, glory, gratitude, and infatuation.
• A Tewa Indian song says that sunflowers are watered by tears of Navajo Girls.
• The tallest sunflower grown on record was 25 feet tall and was grown in the Netherlands.
• The largest sunflower head on record measured 32 1/2 inches across its widest point and was grown in Canada.
• The shortest mature sunflower on record was just over 2 inches tall and was grown in Oregon using the Bonsai technique.