Hi Kelly I have two zone 4 pockets in my zone 5 yard, both of which are only part sun, and I can comment on some climbers that do reasonably well there. Alexander Mackenzie and John Cabot are very similar hot pink roses that rebloom fairly well in this spot and blend together in the photo below. Alex is a year older at 3 or 4 so he's reaching up at right on sturdier canes screaming for me to give him something to climb on; John is flopping over all the place on the left still a little bemused at his fate, but he'll probably look like Alex this year. Both have canes at least 6 feet long here, and I'm presuming they'll grow much bigger as they age. Heaven on Earth is the blush apricot to the left and Folksinger and JP Connell are off to the right, also creamy. Ramblin' Red and Teasing Georgia are both in the same bed further to the left, and they have been mostly cane hardy for me. Teasing Georgia (creamy yellow top left of center) is a more reliable bloomer and rebloomer most years. She can get to about 6-7 feet as a free standing rose and would probably climb better with support. Ramblin' Red I think doesn't like the shade that much, and prefers to bloom on substantial surviving cane. He's the red rose up at top left, and again I've been too lazy to provide any of these guys something to climb on (this year's rose resolution...). I probably only have 3 or 4 pictures of his blooms, and nothing much from last year. That's also a younger Alexander MacKenzie at top right, and some Eutin and Mystic Fairy pink blooms down in the foreground. A thoroughly reliable and tip hardy option would be Darlow's Enigma, who's as happy as I could picture him being in mostly shade under some limbed up pine trees. He's the tallest white bush at center back, and he blooms all season. He doesn't exactly climb for me, and he really seems happiest as a freestanding bush, but he tops out at 8 or even 9 feet for me, certainly higher than I can reach without a step stool and I'm 5' 9". The rest of the photo has assorted hybrid musk bushes which are probably my happiest roses in part shade, but they are only rated to zone 6 and I'm lucky they survive in my zone 5 yard. I've grown several of the other climbers mentioned in this thread, and for what it's worth here are some I don't think will work for you in zone 4. Penny Lane has died on me twice over the winter and I really think it's best at least a zone warmer. Lyda rose has survived but it's not cane hardy, and mine is quite a small rose in this zone with winter kill - I think it's probably only marginally hardy in zone 5. New Dawn has also died twice on me in zone 5, one of the plants surviving a couple of years only to die in an average winter. I can probably keep it alive, but I've never seen a bloom even from the one that survived several years. I can't explain why, but the hmf rankings are only approximations built from whoever logs in from various zones. I'm thrilled that Rebecca's CPM has done so well for her in zone 4! Mine has been oh-so-frustrating for me in my zone 5. It survives without problems and is probably 5 or 6 years old, but it refuses to bloom without surviving cane even though it regrows cane rapidly after being pruned to the ground and has long highly flexible canes. Here's the one and only year I got any bloom from CPM (lots of other company of roses in this shot, as it was a good year). CPM is at center behind the coral toned Meilland Decor Arlequin, and she's wrapped around a 3' pillar many times. Like most Austins I suspect it likes a lot of sun - I'm surprised Teasing Georgia does as well as it does for me in part shade. I think the other climbers on this arch (Mme. Caroline Testout, Harlequin, White Cap, Senegal) are all either zone 5 only hardy or they really want more sun. Hope this helps! Cynthia

My beloved MAC is for me an obvious one that fulfills your criteria, but it depends rather on what you mean by gigantic. I think it might be one of those 'how long is a piece of string' things; she'll probably go as high as there's something for her to climb (thinking of Jackie's towering specimen), but I'd generally describe her as large but manageable, rather than gigantic. She doesn't take up much ground/horizontal space at all, and didn't mind being left to her own devices once established in my hot dry climate. I used to give her a long slow soaking 2 or 3 times per summer, just so she would know I loved her - nothing else. There have been occasional reports of mildew in some locations, but she's usually a marvel of good health. I can't remember if you already have her, but if you don't, I can't think why not... :-)

You'd be surprised at indoor temperature DIFFERENTIALS. A soil thermometer meter or fancy laser can spot 20 degree variations between roots and leaves closer to the lights. If spider mites is the issue than weekly baths and near daily sprays with water or insecticidal soap go a long way. I know miss a few days and they come out of nowhere. Gotta treat plants before they come in. Anything small or not expected to bear fruit for a years or two can get treated with a systemic where the poison is taken into the tree itself.

Ghislaine de Feligonde is doing well with 4hr sun in my Seattle garden. I don't know where you live, but if you have hot summer, GdF would best be in part shade. It easily fades to white in fierce sun. It's also vigorous and reached 6' in three years from a tiny band plant. Both photos were taken in Aug, and your can see its fabulous color changing.