I think what he was trying to say is that “if it hasn’t rained for 18 months trees become very dry”. It still makes little to no sense.Usually, if I stretch my imagination until it snaps, I can just about work out which bit of common knowledge Trump has just been exposed to for the first time and tried - and abysmally failed - to understand, and which he is now attempting to repeat. But I have to admit I am totally foxed by that. What on earth did someone try to explain to him, which he has completely misunderstood and regurgitated as that drivel?
I honestly think that dementia is hitting him quite hard.