Fruit tree grafting is a simple but powerful technique used in nurseries to produce high-quality fruit seedlings. Instead of growing trees directly from seed (which often produce poor fruits), grafting combines a strong root system with a superior fruit variety.

Most commercial fruit seedlings sold in Kenya, especially avocado, mango, and citrus, are grafted.

This guide provides a practical Standard Operating Procedure (SOP) for beginners who want to learn grafting for a fruit tree nursery business.

What Is Fruit Tree Grafting?

Grafting is the process of joining two plant parts so they grow as one plant.

The two parts are:

Rootstock

• The lower part with roots
• Provides disease resistance and strong growth

Scion

• A cutting from a mature tree with desirable fruit qualities

Once joined, the scion grows and produces the same fruit as the mother tree.

Fruit Trees Commonly Grafted in Kenya

Most nursery operators graft the following:

• Avocado (Hass, Fuerte, Pinkerton)
• Mango (Apple, Kent, Ngowe, Tommy Atkins)
• Citrus (orange, lemon, tangerine, pixie)

Less common but possible:

• Cashew
• Guava
• Sapote

Tools and Materials Needed

Before starting, prepare the following:

Essential Tools

• Sharp grafting knife or razor blade
• Secateurs (pruning scissors)
• Grafting tape or polythene strips
• Clean cloth

Nursery Materials

• Healthy rootstock seedlings in polybags
• Scion wood from a mature fruit tree
• Labels for varieties

Hygiene Materials

• Alcohol or disinfectant for tools

Clean tools prevent disease transmission.

Best Time to Do Grafting in Kenya

Grafting works best when plants are actively growing.

Ideal seasons:

• Start of rainy season
• Warm months with moderate humidity

Common nursery grafting periods:

• February – April
• August – October

Selecting a Good Rootstock

The rootstock should:

• Be 3–6 months old
• Have a pencil-thick stem
• Be disease free
• Be well watered

Weak rootstocks lead to graft failure.

Selecting Good Scion Wood

The scion should come from a healthy and productive mother tree.

Characteristics:

• Mature but not woody
• About 10–15 cm long
• With 2–3 buds
• Disease-free

Cut scions early morning and use them immediately.

Step-by-Step Fruit Tree Grafting SOP

Step 1: Prepare the Rootstock

1. Select a healthy seedling in a polybag.
2. Cut the stem about 20–30 cm above the soil.
3. Make a vertical slit about 2–3 cm deep in the center.

This prepares the rootstock to receive the scion.

Step 2: Prepare the Scion

1. Take the scion stick.
2. Trim leaves if present.
3. Shape the lower end into a wedge or V shape.

This wedge allows tight contact with the rootstock.

Step 3: Insert the Scion

1. Carefully open the slit on the rootstock.
2. Insert the scion wedge into the slit.
3. Ensure the cambium layers touch.

Cambium contact is essential for the graft to heal.

Step 4: Tie the Graft Union

1. Wrap the joint tightly with grafting tape or polythene strips.
2. Cover the entire union to prevent moisture loss.

This keeps the scion stable and prevents drying.

Step 5: Protect the Scion

Some nurseries cover the scion with a clear plastic sleeve.

Benefits:

• Retains moisture
• Improves graft success

Step 6: Place Seedlings Under Shade

Keep grafted seedlings under 50–70% shade.

Avoid:

• Direct sun
• Strong wind

This reduces stress on the new graft.

Aftercare for Grafted Seedlings

Proper care determines success.

Watering

Water daily but avoid waterlogging.

Remove New Shoots

Any shoots from the rootstock must be removed so energy goes to the scion.

Pest Control

Watch for:

• Aphids
• Leaf miners
• Fungal infections

How Long Does Grafting Take to Heal?

Signs of success appear after:2–3 weeks

Indicators:

• Scion buds start sprouting
• Leaves begin forming

If the scion dries or turns black, the graft has failed.

When to Remove the Grafting Tape

Tape can be removed after:4–6 weeks

At this stage the graft union has healed.

When Seedlings Are Ready for Sale

Most grafted fruit seedlings are ready in:2–4 months

Depending on:

• Fruit type
• Growth rate
• Nursery care

Grafting Success Rates

Beginner success rates:

• 40–60% initially

With practice:

• 80–90% success

Professional nurseries often achieve above 90%.

Common Grafting Methods Used in Kenya

Cleft Grafting

Most common for mango and avocado.

Veneer Grafting

Often used for mango.

Budding

Common for citrus.

Beginners usually start with cleft grafting because it is simple.

Common Mistakes Beginners Make

Avoid these common problems: Using blunt knives

Crushes plant tissue. Using weak scions

Results in poor growth. Poor cambium contact

Prevents healing. Loose wrapping

Causes drying. Too much sunlight after grafting

Kills young grafts.

Tips for High Grafting Success

Practice Often

Skill improves quickly with practice.

Keep Tools Sharp

Clean cuts heal faster.

Use Healthy Mother Trees

Quality scions produce quality seedlings.

Work in the Morning

Plants are well hydrated.

Maintain Nursery Hygiene

Prevents diseases.

Final Thoughts

Fruit tree grafting is one of the most valuable skills for a nursery entrepreneur in Kenya. It allows you to produce high-quality, fast-fruiting seedlings that farmers are willing to pay premium prices for.

With a small nursery, basic tools, and some practice, beginners can quickly learn grafting and build a profitable fruit seedling business supplying farmers, agro-dealers, and institutions.fruit seedlings sold in Kenya