Q.Why does gardner choose to propagate plants asexually?

A gardener wants many plants that are exactly like a chosen parent, and wants them quickly; asexual propagation gives both. …

Sexual reproduction reshuffles genes at meiosis and fertilization, so seedlings of a prized rose or mango are never exactly like the parent, and a gardener who has a variety worth keeping cannot afford that lottery. Vegetative (asexual) propagation avoids it, and it brings several practical advantages:

• True-to-type plants: every cutting, graft, budded plant or tissue-culture plantlet is a clone of the parent, so flower colour, fruit taste, size and disease resistance are preserved exactly.
• Speed: a propagated plant skips the seedling and juvenile phases and flowers or fruits much earlier than a plant raised from seed.
• Numbers: tissue culture (micropropagation) can turn a few millimetres of tissue into thousands of identical, disease-free plantlets.
• Seedless or poor-seeding varieties: banana, seedless grapes and many ornamentals set few or no viable seeds, so vegetative propagation is the only way to multiply them. …