Begonias... ok... I have a large pot with about 6 of them. They haven't bloomed yet, either, and it seems that they are especially slow this year. I keep mine on the front deck where they get bright light but no direct sun. Mine don't seem to need much water, either.
Why don't you try talking to them. If that seems too silly for you, just breath on them. It's something in your breath that they like anyway, not your words. LOL
Good luck!
<font color=blue>"Our doubts are traitors and make us lose the good we oft might win by fearing to attempt" --Shakespeare</font color=blue>
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Psalm 119:105 Thy word is a lamp unto my feet, and a light unto my path.