Which flowers are considered line flowers from the list?

Line flowers are characterized by their vertical growth habit and are often used to create height and structure in floral arrangements. The correct choice includes Liatris, gladiolus, snapdragons, and delphinium, all of which exhibit this linear form.

Liatris has tall spikes of feathery blooms that add height to arrangements. Gladiolus features tall blooming stalks, making it a striking choice for vertical lines in design. Snapdragons, with their tall spiky flowers, and delphinium, known for its towering presence and beautiful blue flowers, both contribute to the overall line and height in a floral composition.

In contrast, the other options include a mix of flowers that do not consistently exhibit this linear growth. For example, sunflowers and roses tend to have a more rounded or bushy shape, which does not align with the characteristics of line flowers. Understanding floral types is key in floral design, as the structure of the flowers contributes to the composition and balance of an arrangement.