I don't know about Maman Cochet, but Alchymist I think is the usual, half of a year or so. Then again, if it is only one or two canes, you should not panic about training them the perfect direction, you can always prune it later if it is in the way and use the other new canes for training. These first ones usually end up being pruned out in a second or third season, since they tend to look puny and spindly compared to the real canes when the rose means business.

One thing though, it is really good idea to put in arbor or whatever you want them to climb on in advance, since all kludged temporary solutions often just add extra work and need to be replaced pretty soon anyways.

Aimee, when my Maman Cochet was young and newly in the ground it didn't matter at all because I was just fanning out the canes against the trellis with no strain. Thin, flexible canes that potted plants have aren't a problem even though they're hard. It's the canes that are the thickness of your middle finger when she gets older that sprout perpendicular to the trellis and don't seem to want to bend that are the problem unless you can make a nice wide loose bend because you have lots of room. Last year not realizing roses minded being pushed around I would force the canes in the direction EYE wanted tight to the trellis only to find months later that the cane was dead. Unfortunately, my tight situation doesn't allow being indifferent to these wayward canes, so this year I've started cutting them off, sadly. One exception is a very recent cane that decided to sprout about 6" off the ground and headed straight for the house 7' away and across the path. I'm trying to save it by very gently 'guiding' it sideways, but it still makes a sharp turn near the base of the cane so I may still lose it. It was about 6' long when I did this. It really grew all of a sudden, but I could have done something a week earlier, but I forgot about it. But then being quicker with this cane probably wouldn't have helped. I have so little space there that even a few inches could cause someone to trip on it or get scratched by thorns. I should probably just cut it off. All this blabbing is to say that you shouldn't have a problem the first year and into the second. When the rose gets more mature and new canes start getting thicker and aimed in the wrong direction, then you want to start guiding them gradually when they're about 4' - 5', I guess, because the flip side is that if you try to bend them when they're too green, they'll snap. You really have to be EXTRA careful with them. (I have snapped too many.) They're very tender and unforgiving. It's surprising how brittle green canes are. You can't handle them roughly at all.

Sherry

Thanks you guys, that's really helpful!

One thing I've noticed is that you can train those baby canes however you want. Or not train. Doesn't really matter because as soon as the rose takes off in the new spot, those baby canes die pretty quicky and are replaced by MONSTER canes.

Thanks, that makes me feel a lot better!

It still amazes me how the climbers can get those huge canes out of the blue in the third year or so. Not all roses do that, but some really get the canes 3-4 times thicker than the baby canes, looks quite funny when they are still short.