my lobelia is turning brown on part of the plant should I trim the brown part?

Part of plant is nice green and blue flowers. The other half plant is turning brown
What could be wrong.should I trim brown part ?

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1 Comment To "my lobelia is turning brown on part of the plant should I trim the brown part?"

#1 Comment By Downtoearthdigs On 06/23/2019 @ 8:04 am

There could be a few things but I would treat with a fungicide.
Remove the dead parts and dropped leaves and discard.

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