Morning glory can climb vines because it contains an auxin. According to the growth needs of morning glory, sometimes the left one grows fast, and sometimes the right one grows fast, so that the stem rotates and the morning glory can climb the vine. In addition to morning glory, common plants such as cucumber, towel gourd and grape will also climb vines. I don't know if you have noticed, but they don't climb vines like morning glory. They grow a lot of tendrils from the stems, and they use tendrils to tightly wrap the rope to climb up.