Question
I recently bought a honeysuckle vine and potted it in a large pot and placed it on our deck.  It was flowering beautifully, when almost overnight the leaves turned yellow and fell off.  We have had a lot of rain recently, and even though the pot has good drainage, is it possible that it is losing its leaves because of excess water?  It gets sunlight in the morning, does it require more sun?

Thanks.
feroza

Answer
Good morning, feroza -
Yes, too much moisture is often the culprit when it comes to sudden leaf-yellowing and dropping. That said, you do note that the pot has ample drainage, but it's wise to make sure that the drainage isn't simply a saucer. If the saucer itself fills up with water, the plant is still basically sitting in water, and the water really needs to go somewhere. I recommend using "pot feet" or a raised trivet of some sort to lift the pot so it is suspended over the saucer.
Now, if that's not the situation, there could be one of 2 things happening:
1) the plant needs more sun (honeysuckle vines really want at least six hours of direct sun each day to bloom reliably) and/or
2) The plant is suffering from "shock."  This happens. It's usually temporary, and it usually afflicts jasmines more than honeysuckles, but plants generally don't like to be moved into new exposure situations too abruptly, and that may have happened in your case. Or

My money, though, is on the heavy rainfall. Can you lift the vine and its rootball out of the pot to check the roots?  They should be nice and white/light yellow, very visible, and not too tangled up/compressed.  If the roots are dark brown and thready, the plant itself wasn't very healthy to begin with, and if you got it from a reputable nursery they should replace it.
I hope this helps; good luck!