Is there a soil best suited for growing wildflower seeds planted in containers ?
They will, usually, do well in just about any soil! Wildflowers are hardy and adaptable, so don't worry about getting the soil perfect.
Here is an article that will help:
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These articles should help. First you need to remove the grass and rocks. You can solarize to kill the grass or apply a product containing glyphosate.
I live out in the forest up around Newport Washington and around my house is natural wildflowers and then I also have a marsh behind my house closer to my house I've been watering the the plants to keep a green zone for fire protection etc but at the same time we have a lot of really beautiful naturally established wildflowers and I'm wondering with this heat and such how often and what part of the day can I be out there giving them help with extra water thank you very much
Native plants shouldn't need irrigation, but since you are having a heat wave, they might need some extra help. Try to water in the early morning before the sun hits them, and make sure they all get a good soaking, even if you need to run a soaker hose there.
Here's an article: https://www.gardeningknowhow.com/garden-how-to/info/watering-during-heat-waves.htm
I have sterilized (or killed off) my old crabgrass infested lawn. It's under black plastic and ready to be rolled, leveled, and planted w/SOMETHING. I live in northeastern Oregon in a semi-arid area. The area is mostly full sun and has some slope.
We have just the articles to get you going!
You have relatively mild winters, so you can plant at just about any time. I do recommend spring, but it won't hurt to sown in fall. Here is an article that will help you to get started:
Can wildflowers be grown in an indoor hydroponic system?
It is certainly worth a try. You will probably need supplemental lighting. These articles should help: