I've never tried planting cucs in a container and honestly, I'm not sure how well that would work. They like to climb/crawl and need to room to spread out. I have several cucs planted in my garden and they are fairly close together but they have plenty of room to sprawl out. Some of my vines, if you stretched them out straight would be around 4-5 ft long.
do you have a trellis you could move that pot next to and allow the vines to climb upwards?
do you have a trellis you could move that pot next to and allow the vines to climb upwards?