Answer: The seeds you sow for a meadow or wildflower garden will include all kinds of annuals and perennials, chosen for their ability to self-sow and overtake an area. Whether or not the mixture has grasses, the seeds will eventually end up in other areas of your yard, carried by wind, birds, or even water. The only way to stop this is to cut off the flower heads before they develop seeds. That's not too practical, but it is an approach to keeping the wild areas contained. As long as you keep an eye out for these plants in your lawn and other flower beds and pull them when you first discover they have escaped, they won't pose too much of a problem. If you're not inclined to scout for intruders and they get a foothold, your entire yard could eventually become a wildflower meadow.
Hope this information helps you decide whether or not to plant a meadow!
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