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I have many lilies of the valley around a big old maple tree. For years, the flowers (around this time) have been super. Last year, right before blossoming, we put mulch all around the tree and the lilies of the valley. We got no flowers. This year, I didn't mulch and the greenery of the lilies is terrific. I got three flowers. What should I do?
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Lily-of-the-Valley flowers buds are produced the year before. Your plants may benefit from an application of dolomitic limestone. This will slightly raise the pH of the soil. In our experience, Lily-of-the-Valley enjoys more alkaline conditions. Feed with Rich Earth and Plant-tone. We have found that some mulches may lower pH. The best mulch is long-lasting shredded pine bark or pine needles. Hopefully you'll have a good bloom next year!