Macadamia nuts originated in Australia, but also are found in other warm climates on a bush type tree that reaches approximately 40 feet in height and width. The nuts will not produce until 4 to 5 years after tree planting with full production around 12 to 15 years of age. Macadamia trees prefer moist soil conditions and have roots that grow close to the soil surface to optimize moisture absorption.
Growing Macadamia Nut Trees
Purchase macadamia nut seeds from a garden supply store. Soak seeds in water for 24 hours prior to planting.
File a groove into each seed shell with a hand file to assist with the start of germination.
Prepare the soil by adding peat and sand to make a mixture that will drain well. Macadamia grow well in a soil that stays moist but not wet.
Plant the seeds in the soil mixture. Place the container in a location that gets full sun or indoors under grow lights. Young saplings do not tolerate cool temperatures. Water the plants frequently to keep the soil moist.
Fertilize the young trees 6 months after planting using a fertilizer that is less than 1 percent nitrogen. Continue to fertilize the trees twice a year with a low nitrogen fertilizer.
Plant the seedlings into the ground once they start growing. The trees grow into a large bush type tree quickly the first 4 years. Provide wind protection as the trees form shallow roots. Protect young plants from frost if necessary.
Harvest the nuts once they start producing. It is best to harvest every 2 weeks in dry and sunny locations and every week when the conditions are wet. Remove the husks immediately to prevent molding.
Dry the nuts for 3 weeks before cracking them. Another option is to dry the nuts in a food dehydrator set on the low for 2 to 3 days. Test the nuts after drying to verify the shells are brittle and crack clean.