“I was living my best life until the porch turned into a broiler.”
This looks most like sun/heat scorch rather than a watering or nutrient issue. Dieffenbachia prefers bright, filtered light and is sensitive to direct sun, especially in hot North Florida conditions. The bleached patches, curled leaves, and crispy brown edges fit leaf burn from excess light and heat buildup on the screened porch.
Move to safer light and reduce heat stress
Shift it out of direct sun immediately. Give it bright shade or very filtered light, then water thoroughly if the soil is dry. Remove only fully dead leaves for now.
Also possible, but less likely
What would prove it
Watch for stop in new damage
If the light issue is the cause, the damage should stop spreading on newer leaves once it’s out of direct sun. If new leaves keep browning, check watering and drainage next.
Turn this into a recovery case
One photo gives a diagnosis. Tracking proves whether the plant is recovering.
Don’t leave the diagnosis hanging 🌱
Save it now, then use the next photo to confirm if this was the right call.
Create account & save plant 🌱