What floral technique involves intertwining branches and stems?

Weaving is the correct answer because it specifically refers to the technique of intertwining branches and stems in floral design. This method allows designers to create a natural, organic appearance and is often used in creating intricate arrangements, wreaths, or structures where elements can support one another in a visually appealing way. Weaving establishes a sense of texture and depth, giving the design richness and complexity.

Other options like layering, binding, and twisting pertain to different processes within floral design. Layering focuses on placing elements in different levels or on top of each other for a visual effect; binding refers to securing stems together, typically using wire or other materials; while twisting generally involves spiraling elements to create a specific look or structure. Each of these techniques serves distinct purposes, but they do not capture the essence of the intertwining action that is central to weaving.