I have a new border in which I have planted a mixture of spring and summer flowering bulbs and shrubs. The bulbs include lilies, tritelia, tulips, and Ixias. I have also sown some annuals, including california poppies, calendula and nasturtiums. In order to keep down the perrenial weeds which include creeping buttercup I would like to lay a mulch approx 4" to 6" deep. I intended to use chipped bark as the mulch. Will the bulbs be able to penetrate this next Spring and Summer and will the annuals self seed and grow. If they can penetrate the bark mulch why can't perrenial weeds? Any help/advice you can give in this respect would be appreciated.
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