Answer: I've found that you have to sow the seeds thickly in order to produce a wildflower meadow. This is because some seeds sprout right away and others sit and wait until cooler weather to sprout. To complicate things, some plants are annuals, some perennials and some biennials. They do reseed, though, so eventually you will have a gardenful of flowers, but it does take several years. I'd overseed two years in a row to hurry things up!
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