The vines might have suffered from lack of nourishment this year.  None of the boxes supporting morning glories were replenished with any kind of slow release ferts.  Next year, if there’s a next year, we’ll put at least 10% mushroom compost into the mix.  The alley planters cubic feet are:

Box 1 = 1.5*1.5*4 = 9 cuft

Box 2 = 1.5*1.5*3 = ~7 cuft

Box 3 = Box 1 = 9 cuft

Box 4 = 1.5*1.5*6 = ~14 cuft

Total = ~40 cuft

Total Mushroom Compost = 4 cuft @ 10% , 8 cuft @20%

= 2 – 3 2 cuft bags for alley planters.