1000 Seeds Organic Poppy Flanders Stunning Bright Red Flower Native to Europe. The Flanders poppy as it is now usually called, grew profusely in the trenches and craters of Europe during WWI. It was later used by French servicewomen to raise money for the families who lost men in the war. Today it is probably the world’s most popular wildflower because of its brilliant and striking colors as well as it’s ability to grow wild year after year. Annual likes full sun-part shade The FLANDERS Poppy in this package will grow to a mature height of about 12 to 24 inches tall. These plants prefer an area of full sunlight. Blooms June through September Zones 3-10.