I planted (from seed) Morning Glory's and enjoyed them all summer. Now they look like they are dying. There are still a few blooms on the top of the trellis but the vines are brown and dying. What should I do now? Should I pull them from the roots and clear them all from the trellis? Should I just trim them back and hope they return next summer? I was hoping they would just stay forever and ever. If I have to get rid of them is there something else I can plant in their place for the coming Fall and Winter season? This "newbie" from SC thanks you in advance for your kind suggestions.