Mike, so you are saying that they stayed outside above the ground on the north side of the house through the winter in Michigan? My first guess would be that they are toast. ANY plant held over winter in a one gallon in Michigan should have been "healed in" or buried, pot and all, on a PROTECTED side of the house (east or south). With no pix, I vote dead. If not, I want a cutting of this hypericum to plant patent! We can be rich!
hortster

I have 2 types of Hypericum, but I don't recall their cultivar names. The variety with the big flowers, which I also got at Lowes, dies back to the ground each winter & reliably re-sprouts each spring. So far, I only see a few small shoots - but by June I'm sure I'll have 3 healthy shrubs at least 3' high & wide.

I'd just cut them back, have faith & be patient.

I paid too much for a shrub last year, then stupidly left it on the patio for a couple weeks around a corner. One of my dogs decided to water it for me, repeatedly, and I thought it was dead. Last fall I dumped the root ball behind the garage, west exposure, & this spring discovered it sprouting like crazy.

Ya never know what will survive neglect...