Concept:
Grafting is a method of vegetative propagation in which the stem (scion) of one plant is joined with the rooted portion (stock) of another plant.
Step 1: Identify the suitable method.
Fruit plants such as
\[
\boxed{\text{Mango and Citrus}}
\]
are commonly propagated by grafting to obtain better quality fruits and early bearing.
Step 2: Analyse the options.
• Hybridization -- Produces improved varieties through crossing.
• Cutting -- Suitable for plants like rose and sugarcane.
• Grafting -- Used for mango and citrus. \checkmark
• Layering -- Used in jasmine, bougainvillea, etc.
Step 3: Final conclusion.
Hence, the correct answer is
\[
\boxed{\text{Grafting}.}
\]