Production of walnut requires you have lot of patience, because it takes 6 to 7 years for it to mature for harvest after planting the walnut sapling.

• Site selection. Select a location with well draining, loamy soil. Avoid steep slopes, ridge tops, rocky soil, and soil with large amounts of clay.
• Select good seedlings.
• Water occasionally during dry season for two to three years when the weather is very hot, because regular watering will harm the plant, whether grown from nut or seed.
• Remove weeds away from the soil and mulch when the plant sprout and grow to an extent.
• Fertilize the tree as soon as it has grown past sapling size.
• Test the soil pH after fertilizing to see if you need to adjust it back to normal levels.
• If you have not pruned trees before, especially saplings, look for an experienced pruner to help you identify leaders and important branches is recommended.
• Prevent pest invasion, squirrels are a common in walnut groves, and can take an entire crop of nuts if not controlled.

Precaution: Walnut husks can stain and irritate skin and clothing. Protect yourself with waterproof gloves.

Source: Afrimash