Sand burrs, stickers, goat heads... They are a pain! One good thing to come from them is the idea for Velcro!
To get rid of them, you need to improve the soil. The least expensive way to go would be to apply dry molasses at 20 lbs per 1000 square feet. If you have acreage, it is my understanding that people have had success with 5 - 10 lbs per acre. It just depends on the budget and other soil conditions.
Fall is the best time to apply 1/2" - 3/4" of good quality compost to the entire yard. It's a bit of work, but the results are amazing.
Regarding the seeds, they can be dormant for several years. Under the "right" conditions, the seeds will germinate. This is true for most, if not all seeds.
_________________ Nadine Bielling Moderator Gardener Exchange Forum
The Laws of Ecology: "All things are interconnected. Everything goes somewhere. There's no such thing as a free lunch. Nature bats last." --Ernest Callenbach
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