The poppies grow really easily. Just toss seeds out in October and they bloom in spring. They will reseed year after year. Once you know what the seedlings look like, you can remove other weeds and let just the poppies grow where they like. I also collect seeds to save for the next year. Mine are just now starting to shoot up some flowers. If they don't sprout, try again with them in October, and just sprinkle the seeds where you want them to grow.

I had no idea they have medicinal value, that's interesting! I found a link others might find useful. They're so pretty and attract birds and bees into the garden.

Here is a link that might be useful: California Poppy Tincture

there are lots of plants with medicinal value. Almost everyone has some in their garden whether they know it or not. I tend to focus on edibles, but one thing I made sure to plant this time is stinging nettles. They make very healthy tea, and you can eat them just like spinach. they're very high in protein and iron..etc.
Another one I planted is lovage. People don't think of it as medicinal because it's sort of related to parsley/cilantro/celery family, but it happens to be very high in quercetin. I have a liver condition, for which quercetin is very much indicated, so why not get it right out of my garden? besides it tastes fabulous in soups. I wish I had room for an olive tree. Olive leaf extract is one of the most potent anti-viral and anti-oxidants you will find. I'm supposed to do chemo, but I'd rather do this instead of ingesting poisons.