Question

which of the following plants are commonly propagated by layering?
a. rhododendron, azalea, viburnum, holly, lilac
b. bean, tomato, pea, corn, squash
c. black raspberry, boysenberry, strawberry, red raspberry, african violet
d. apple, pear, peach, cherry, plum

Explanation:

To solve this, we analyze each option:

• Option a: Rhododendron, azalea, viburnum, holly, lilac are woody plants commonly propagated by layering (a method where a stem is induced to root while still attached to the parent plant).
• Option b: Bean, tomato, pea, corn, squash are typically propagated by seeds or other methods like cuttings (not layering).
• Option c: Black raspberry, boysenberry, strawberry, red raspberry, African violet are propagated by methods like suckers, runners, or leaf cuttings (not layering).
• Option d: Apple, pear, peach, cherry, plum are propagated by grafting or budding (not layering).

Answer:

a. Rhododendron, azalea, viburnum, holly, lilac