Poppies are probably my favorite annual to grow in my garden because they're dependable flowers, attract bees, and grow in poor soil. I've blogged about how I sow poppy seeds in the garden, but they're prolific self-seeders too. Poppy seeds remain for years in the ground and will sprout when the soil is turned over and they're exposed to sunlight. While I save poppy seeds from my garden, I let most fall to the ground and self-sow. The one downside of self-seeding poppies is that they'll germinate in clumps which grow weaker poppies, but I've found transplanting poppy seedlings into other areas of the garden to be pretty easy after some observation and experimentation.