Answer: Actually, phosphorous promotes flowering (along with helping strengthen stems). Potassium is the element that promotes healthy root growth (along with working in conjunction with the other two elements). So, a fertilizer without phosphorous would be great for non-flowering plants.
Wait for the foliage on your tulips to die down on their own. Once the leaves are crispy brown you can dig the bulbs, pull off the leaves, and store the bulbs in a cool place until September. At that time you can replant them in your garden.
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