I planted my first grapevine in a container this spring and it was growing quickly and seemingly very healthy. In the last several weeks, the growing seemed to stop and in the last 1 1/2 weeks, lower leaves have begun to yellow and drop off. I cannot identify any pests, however, around the same time my morning glory vine also began to yellow and leaves have dropped, though much more quickly than the grapevine. The plants are in 2 separate containers and have about 1 to 1 1/2 feet between them. I have searched for ideas about what to do, and haven't been able to figure it out. I really don't want to lose the grapevine. Any ideas? Thank you.