Start seeds of Shirley poppies in late fall. Fill small nursery pots or flats with a well draining potting soil and then water the soil with a mist from your hose. Scatter seeds on the surface, pat them down with your palm and then mist again.
Keep your seeded pots in a sunny area indoors or outside: cold temperatures will not affect seedling growth, although seeds germinate best when exposed to a soil temperature between 60 and 70 degrees Fahrenheit.
Thin the seedlings to stand about 2 inches apart when they are about 2 inches tall.
Amend the soil in a sunny area of your garden with organic compost if you need to improve the drainage: use one part compost to each four parts of soil.
Transplant the seedlings to the garden after your final spring frost. Carefully remove each seedling from the potting soil with a spoon or trowel, taking care not to damage the roots. Dig planting holes large enough for the root systems of your seedlings about 6 inches apart. Then set one plant into each hole and fill by scooping additional soil into the hole and lightly tapping it down around the base of each plant.