Answer: If the plants are collapsing, I suspect a root rot. Typically Giant Bird of Paradise will grow with disease problems, unless the soil retains too much water. In this case the roots can suffocate. When this happens the upper parts of the plant begin to turn yellow and then collapse. The only way you will know for sure is to dig down near the plant and inspect the roots. Root rot will be quite evident by the mushy appearance and an odor. Wish I had something more encouraging to offer!
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