A well installed microcode bug will be almost impossible to detect.
One is that the perfect garden can be created overnight, which it can't.
It is only the inadequacy of the criminal code that saves the hackers from very serious prosecution.
So maybe I can go back to being a Gardeners' World addict again.
On the one hand, the press, television, and movies make heroes of vandals by calling them whiz kids.
No amount of source-level verification or scrutiny will protect you from using untrusted code.