It depends on your climate. Where do you live? In my climate, Northern California, it doesn't rain in the summer, so the best time to plant wildflowers is in the fall for the following spring and summer. Sometimes you can get away with early spring planting, but it will require more watering. I've even known someone who planted wildflower seeds in the summer and watered liberally twice a day! You will need to manually water the seeds or rely on the rain.
You may also want to protect your seedlings from birds and other hungry wildlife. Otherwise the birds may think you are offering them birdseed! You can use overturned nursery flats, floating row cover, or other physical barriers that allow water and light to reach the seeds. If snails and slugs are a problem, be prepared to block them as well. In my area, lupines are difficult to grow from seed unless you use beer traps or other snail/slug diversion methods.
And finally, the most important factor in a successful direct planting is to make sure the ground where you are planting your seeds is as weed-free as you can get it. Most soil has a substantial weed-seed bank and, once you disturb the soil and expose those seeds to light, the weeds will grow. Once you start watering and tending that ground, the weeds will often overtake and outcompete your desired seedlings. An important strategy is to learn to recognize your wildflower seedlings when they are quite small so that you are not weeding them out! If you don't already know these plants, you can pick out all the different seeds and germinate them on a moist paper towel (to make sure all the different plants are represented), and then grow them in a small container using sterile potting soil (to ensure that no weed seeds are in the mix). Googling seedling photos can help, but in my experience, there's no substitute for learning to recognize tiny seedlings. Subtle differences in color, shape, etc. are easy to spot on real seedlings, whereas a photo might look like 5 different plants.
Of course, the easiest way is to loosen your soil, broadcast the seeds, cover them with a very thin layer of soil as a bird barrier, step on the soil to get good seed/soil contact, make sure they get enough water, and then let nature decide which flowers flourish.
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