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.
Maybe it's just me, but I had the darnedest time trying to remember what seed scarification and seed stratification meant, and which seeds needed which treatment before planting them, when I first started gardening. Seed scarification and seed stratification were the seed starting equivalent of its and it's. You may see its and it's misused here on this garden blog from time to time. Fortunately for my garden I've pretty much mastered scarification and stratification.
Growing plants from seeds is probably my favorite part of gardening. My second favorite part of being a gardener is finding ways to make gardening easier for myself and spending less money. While I spend a lot of time growing seeds in plastic baggies, and making homemade biodomes, I find direct sowing seeds to be the best method for perennials. Take, for example, this purple coneflower seed head I direct sowed in the garden last fall. Purple coneflowers are so inexpensive at garden centers and nurseries, but they're even cheaper to grow from seed, especially if you direct sow your purple coneflower seeds in the fall.