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Excerpt from page 3 - The Weed Seed Bank
All gardeners can assume that every square inch of their garden soil contains weeds. Some of them may have been there for years, while others dropped or blew in only yesterday. The seeds that exist naturally in any soil are called the soil's seed bank. And just as with the dollars in your checking account, repeated withdrawals will make the balance go down. If no deposits are made (by allowing weeds to drop seeds or importing weed-seed-bearing manure or topsoil, for example), you can make your balance go lower and lower - maybe as much as 25 percent a year in the first three years. But you will never completely bankrupt your soil's weed seed bank, for some seeds will always blow in or perhaps hitch a ride on the feet of a passing bird.
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