Growth Conditions of the Shirley Poppy

Location

• A native of Europe, the Shirley poppy has naturalized throughout the United States. The plant is tolerant of full sunlight, as well as partial shade. Expect more flowers from plants grown in full sunlight than those grown in shadier conditions. The plant is not especially frost tender and is hardy all the way down to USDA zone 5. Shirley poppies work well when massed together in the garden for late spring and summer color.

Soil

• The Shirley poppy is not picky about soil and frequently pops up unannounced in abandoned meadows and lots and along roadsides. The plant does best in a rich, well-draining sandy soil, though it will also grow in infertile, poor soil. Water regularly to encourage healthy flowering and to keep the leaves from yellowing. The poppy will suffer if grown in heavy, clay soils that are consistently flooded or waterlogged.

Propagation

• Seeds take between 10 and 14 days to germinate, requiring a soil temperature of at least 55 degrees F. They should be placed in the soil outdoors in their permanent location because they do not transplant well. The fine, small seeds can be mixed with sand to make sowing more even. Cover with a thin layer of soil to help aid germination. For best results, sow seeds in late fall in warmer southern climates, and in early spring in cooler, northern climates.

Considerations

• Though not invasive, Shirley poppies are self-seeders that can spread and become aggressive in the home garden. Remove spent flowers to keep the plant from seeding. Dried seed pods can add ornamental interest, however, and may be clipped and used in flower arrangements. Red dye may be obtained from the flowers, and the petals can be dried and used to add color to potpourri. Shirley poppies have medicinal value, though they should not be ingested without the assistance of an expert.