Answer: You're right, too much nitrogen can result in lots of lush, green growth, at the expense of flowers so feeding with a low nitrogen fertilizer is best. Use a 5-10-10 and feed early in the season, after the stems have begun to emerge. Since your plants are getting plenty of sunshine and water, the only explanation to non-flowering is that you might be planting them too deeply. The tubers should be planted only 4-5" below the soil surface. Hope this information helps!
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