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Most types of lily, including daylilies, can be divided and transplanted in spring or fall. Columbine plants can be cut back in the fall and transplanting can also be done at this time or wait until spring.

If you have a spot in the garage where you could put the potted rose and columbine that would be best. Place them up on some wood and not directly on the concrete floor too. Keep an eye on the soil moisture in the pots with a moisture meter. You do not want the soil wet, just nicely moist. If there is a little sunlight coming into the garage in the area where they are stored, that would be good as well. If you do not have a garage to place them in, then I would move them up close to the house wall and build a tented area around and over them. On nice warm days, leave the big flap on the tent open and on cold days leave it closed up. Since decks typically have open areas between the deck boards, it would be good to lay down some plywood or perhaps some duraroc material to provide a closed floor area for them to keep the cold winds out. Keep an eye on the soil moisture with this method too.

If you have a spot in the garage where you could put the potted columbines that would be best. Place them up on some wood and not directly on the concrete floor too. Keep an eye on the soil moisture in the pots with a moisture meter. You do not want the soil wet, just nicely moist. If there is a little sunlight coming into the garage in the area where they are stored, that would be good as well. If you do not have a garage to place them in, then I would move them up close to the house wall and build a tented area around and over them. On nice warm days, leave the big flap on the tent open and on cold days leave it closed up. Since decks typically have open areas between the deck boards it would be good to lay down some plywood or perhaps some duraroc material to provide a closed floor area for them to keep the cold winds out.

This sounds like a fungus. Try treating the plants with a fungicide.

Also, make sure that they are in the right kind of exviroment. These plants do best in at least a little shade.

Hi,

My plants always did that half-way through the summer, but they came back the next year. (In my zone, they are a short lifespan perennial usually surviving 3 years or so. After that its best to start over, but that is easy since they reseed themselves.)

Best of Luck,
RustySpade
http://rustyspade.com

Yes, you can cut them back. Also, since you live in a fairly cool region, mulch will help add some winter protection.