Answer: Glads bloom only once a year and once the flowers are spent, some glads will produce seed pods where the flowers once were. That is probably what you are seeing; seed pods not additional flower buds. Since the flowers on the spike open from the bottom up, you can sometimes extend the season by snapping off the oldest flowers as they fade; this sometimes encourages the plant to grow the flowering spike a little taller and develop additional flowers as it elongates. Sometimes, not always. When the flowers have faded, cut the entire spike down to foliage level. Hope this clarifies things for you!
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