If you've ever braided hair or a rope, it's not that different. You just have to weave new ones in as you run out of stem length. [By way of demonstration, Shun starts weaving two of the black flowers and one of the red ones together, the motions familiar and light. Once one of the stems of the black ones begins to run out of length, he lines a red one up on that side to continue weaving them together.]

It keeps going like that until it's long enough to be connected.