It looks like Sedum reflexum. That isn't a bulb but a succulent. I don't know how much you cut them back but they will probably survive the pruning. Usually I just trim off the dead flower stalks in the spring and remove any that are growing where I don't want them. Marcia

I was going to say the same thing but waited. If it is something that you have planted in rows, 18" apart, then its got to be some garden veggies not morning glories. So, as Fatamorgana has suggested, it might be sweet potatoes. I have not seen anything other than morning glories with three-lobed leaves. Never planted sweet potatoe. Passiflora Incarnata has similar leaf shape, but I doubt that you planted that one.

Your plant, one of my favorites) is Bush Ivy (Fatshedera lizei). It is important to understand how it grows to use it correctly. Unlike other ivies, it does not have little roots that cling. It must be supported (espalied) on a wall, fence or pergola. As it matures in your zone it will send out branches that could be 12' long and it becomes very heavy so needs a strong support. It can be pruned back and controlled any time of the year. I have grown it on a fence using tiers of grape wire supended through screw eyes and the branches afixed to the wire with single wrap velcro. Also, the entrance to my garden in a former home was a strong arch with Bush Ivy secured to it. In the late winter you will note quite a bit of yellowing and dropping leaves. Normal situation not to worry about. Hopefully you can find a growing situation for this plant. It is a beauty.

Also known as Heal-all, Prunella vulgaris is used in herbal medicine and the leaves are edible.