Matilija poppy (Romneya coulteri) growing in my front yard.
I planted a one gallon pot of these a few years ago in the fall, and didn’t do a thing. Seriously. Not a thing. Now I have 6-8 foot tall stems covered with these giant fried egg flowers starting in the late spring and blooming all summer. They’ve filled in about 4-5 square feet of space and are still spreading. It smells good, butterflies like it, and the deer don’t. It doesn’t get any direct water, but some nearby plants get weekly water once a week during hot weather.
Plant them in full sun in the fall when the rainy season starts. That’s it.