Macadamia

Growth Habit: Macadamias are large, spreading evergreen trees reaching 30 to 40 ft. high and almost as wide. More upright types are known and being selected because of their suitability for closer planting.
The bark is rough but unfurrowed, brown and dark red when cut. The macadamia has proteoid roots, dense clusters of short lateral rootlets in well defined rows around the parent root axis. The prime function of such roots appears to be in increasing the surface area of the root system for maximum absorption.

Fruit: Macadamia nuts have a very hard seed coat enclosed in a green husk that splits open as the nut matures.

As the common name indicates, this seed coat is smooth in the case of M. integrifolia. It holds a creamy white kernel containing up to 80% oil and 4% sugar.

Frost Protection: Frost protection is more critical for young trees than more mature ones. While they are still on the small side, the plants can be given the standard methods of protection, such as plastic sheeting and such draped over a frame around the tree.