Macadamia nuts are native to eastern Australia and grow on large evergreen trees. These nuts are high in vitamins and minerals and are an excellent source of protein and good carbohydrates. Macadamia nut trees are fast growing trees that prefer mild, frost-free climates that get an adequate amount of rainfall. They grow very well in southern coastal areas of California. Exposure to extreme hot temperatures for any length of time will reduce the yield of the nuts.
Choose an area to plant your trees that will get full sun for the majority of the day. If the trees will be exposed to hot temperatures, choose a location that receives shade for half of the day. Avoid a location that will be exposed to a lot of wind. The smaller branches of the macadamia tree can become broken and damaged in the wind.
Test the soil before you plant your macadamia seedlings. These trees do best in soil with a pH of 5.5 to 6.5. Use a soil test kit and then adjust the soil based on the pH percentages in your test kit. If the soil pH is too low, add a lime fertilizer. If the soil pH is too high, add sulfur to the soil to lower the pH. Follow the instructions on the container for both additives.
Dig a hole that is as deep as the root ball but is twice as wide. If the root ball is 3 inches then your hole will be 3 inches deep and 6 inches around. This will give the roots plenty of room to spread out.
Water the young seedlings daily with about an inch of water. The soil should remain moist and not be allowed to dry out. Once the seedlings have been established, decrease the frequency of the watering but still maintain moisture in the soil. Water the trees two to three times a week with at least an inch of water.
Apply a citrus mix fertilizer approximately six months after you have planted your trees. Mix one to two gallons of 4-3-3 fertilizer with 20 to 80 gallons of water. Use a field sprayer and spray the soil. Apply this fertilizer every spring and fall to produce the best fruit yield.
Prune the macadamia trees so that you have one main stem with many horizontal branches. Cut back any dead or diseased branches to promote healthy fruit production.
Harvest your macadamias when they begin falling onto the ground. Gather them quickly and do not allow them to lay for more than a few days, or they will become victim to rot and insects.