The soil for our gladiolas was well fertilized before planting. Now, however, our gladiolas are turning yellow and drooping. They are still young and have no bulbs yet. They are planted in a raised flower bed around a large tree, so they get partial sun. Do you think we need to trim the branches back? We are not sure if they are suffering from not enough sun or maybe they need more fertilizer. The stalks shot up nicely and are tall, but no flowers and they are getting yellow.
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The following articles should be of some help to you: https://www.gardeningknowhow.com/ornamental/bulbs/gladiola/care-of-gladiolas-how-to-grow-gladiolas-in-your-garden.htm