Crop Propagation Methods SS1 Horticulture and Crop Production Lesson Note

What is Crop Propagation?

If you have one beautiful mango tree and you want ten more, how do you get them? That is what Propagation is all about. It is the process of increasing the number of plants of a particular species.

In Horticulture, we have two main ways of doing this:

1. Sexual Propagation: Using seeds.
2. Asexual (Vegetative) Propagation: Using parts of the plant like stems, roots, or leaves.

Just like humans, plants can have “babies” that come from seeds (sexual), or they can be “cloned” from a piece of the parent plant (asexual).

Sexual Propagation (The Power of Seeds)

This is the most common method. When a male part of a flower (pollen) meets the female part (ovule), a seed is formed.

Why use seeds?

• It’s Easy: Seeds are easy to carry, store, and sow.
• Cheaper: Buying a packet of seeds is usually cheaper than buying 100 seedlings.
• New Varieties: Sometimes, seeds produce a plant that is even better than the parent (though sometimes it can be worse!).

The Downside:

• Waiting Time: Some seeds take a long time to grow into a tree that bears fruit.
• Surprises: The fruit might not taste exactly like the parent fruit.

Asexual Propagation (The “Clone” Method)

In Asexual Propagation, we don’t need seeds. We take a part of the parent plant—like a branch or a tuber—and turn it into a new plant. Because it comes from only one parent, the “child” is a perfect copy or a clone.

Why use this method?

• Exact Copies: If the parent orange is very sweet, the new plant will be exactly as sweet.
• Faster Growth: A plant grown from a stem cutting often produces fruit much sooner than one grown from a seed.
• Seedless Plants: Some plants, like seedless grapes or some pineapples, don’t have seeds at any rate!

Common Asexual Methods

Here are the ways we do this on the farm in Nigeria:

1. Cuttings

We cut a piece of the stem (like in Cassava or Hibiscus) and stick it into moist soil. After a few days, it grows roots and becomes a new plant.

2. Grafting and Budding

This is like “plant surgery.” We take a bud or a branch from a very sweet fruit tree and join it onto the root of a very strong, wild tree. They grow together as one.

• Budding: Used a lot for Citrus (Oranges/Lemons).
• Grafting: Common for Mangoes and Rubber trees.

3. Layering

We bend a branch of a living plant down to the ground and cover part of it with soil while it’s still attached to the parent. Once it grows its own roots, we cut it off.

4. Tubers, Corms, and Bulbs

Plants like Yam (tubers), Cocoyam (corms), and Onions (bulbs) grow special underground parts that we can replant to get new ones.

Which Method Should You Choose?

As an SS1 student, you need to know which method fits each situation. Here is a simple guide:

Summary for the Garden:

• If you want to create a new variety, go with seeds.

If you want to multiply a very good tree quickly, go with cuttings or budding