Spoonerism (18).
Definition is "type of tree (in hot places)".
Non-Spooner phrase: first word (3) means "to criticise" (verb); second word (4) means "location for growing" (noun, agricultural).
Problem for me was that the second word needs to be pronounced with a British accent (I'm American). If you merely interchange the first letters of the two words, the solution appears to be spelled incorrectly.
But after due deliberation, I decided that the hybrid Spooner-homophone device is OK, since the Reverend was speaking when he made his eponymous blunders. 🤣