Wildflowers Advice

I live in NW Arkansas, I need colorful wildflowers from spring to fall.
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Our Stock's Wildflower Mix would provide that for you. There are 36 species of both perennial and annual flowers. You can expect the first flowers to begin blooming in 8-10 weeks with more blooms following throughout the year when planted mid-late spring. The following year there will be blooms beginning in early to mid spring and lasting all through the season. Blooms will increase year by year as the perennial flowers establish.

We planted wildflowers in April, on a hillside. When do we burn it off to promote growth and manage weeds? Right now there are a lot of brown stems, do we have need remove those if we don't burn this year?
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Wildflowers break dormancy earlier than native grasses so we recommend burning in early spring (late March or early April). Do not burn until plants are fully established (year 3+). Mowing/Shredding thatch in early spring is a good way to clear the area to promote new growth if burning is not possible. 

Which wildflower mixture do you recommend for clay soil in full sun?
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Any of our in-house wildflower mixtures should do well in clay soil and full sun! For a backyard border, the Backyard Retreat is a nice choice. For a Mid-height mix, the Stock's Wildlfower Mix, an for a shorter border, try the Husker Li'l Mix.