Telephone

When I was just as far as I could walk
From here to-day,
There was an hour
All still
When leaning with my head against a flower
I heard you talk.
Don't say I didn't, for I heard you say--
You spoke from that flower on the window sill-
Do you remember what it was you said?'

'First tell me what it was you thought you heard.'

'Having found the flower and driven a bee away,
I leaned my head
And holding by the stalk,
I listened and I thought I caught the word--
What was it? Did you call me by my name?
Or did you say--
Someone said "Come" -- I heard it as I bowed.'

'I may have thought as much, but not aloud.'

"Well, so I came.'

Robert Frost

I don't get it and is it a dramatic monolouge or no cause i'm not sure.

An unsatisfying example of a dramatic monologue, as compared to Browning's beauties such as My Last Duchess, The Laboratory, and Porphyria's Lover, but it certainly seems to fit the definition:

"A literary, usually verse composition in which a speaker reveals his or her character, often in relation to a critical situation or event, in a monologue addressed to the reader or to a presumed listener."

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what's it about? I'm not sure how to explain it.

It doesn't seem to be a monologue, but a dialogue. He says he was listening to a flower (his head against a flower) as if it's a telephone, and he heard her talk. (from another flower, really like a telephone line). He says he heard "come", so he came. (and now he is explaining "in real" why he came. She told him to on the flower-phone.