Answer: Your dieffenbachia has reached maturity and is developing flower spikes. When they open, the flowers will look like the blooms on a calla lily. There may be some sterile spikes forming as well, and these will look like thickened stems with a thicker green coating along the top few inches.
Flower production is a natural process, in fact it's a bit of a reward to you for providing the ultimate in care for your plant. Let the flowers grow. When they start to fade, cut the flower stalks down to foliage level.
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