My apple trees will never get across.
Which figure of speech is this??
No idea. Where does this come from?
Is it metaphor or personification?
That all depends on what you mean by "get across."
"...will never get across (what?) "
It's a sentence from a poem
Title? Author?
And are those your only choices?
Mending wall by Robert Frost
It helps (even with a poem) to include the WHOLE sentence!
My apple trees will never get across
And eat the cones under his pines, I tell him.
Now it should be clearer.
If it's comparing two things, it's a megaphor.
If it's giving human characteristics to non-human things, then it's personification.
Then above sentence is personification?
Right.
Use this link for explanations and examples when you need:
http://www.tnellen.com/cybereng/lit_terms/