Hi G.B.,
Probably a lack of nitrogen. Add some decent fertilizer every two months.
This is really important for potted plants which can't draw needed nutrients
from soil.
J.Lane
"G. B. Gaal" wrote in message
...
Hi:

I have two pots of hyacinth vines on my balcony. Both were planted at the
end of May, both get the same amount of sunlight, the same amount of water
(I think) and both have vines about 5'-6'. However, the leaves of one are
becoming pale green with a yellowish tinge. Otherwise, there is no
drooping or browning. Is something wrong?

Thank you.

Geraldine