Propagation
Seeds require moist stratification at 20º C (68°) to 30º C (86°F) for 28 to 60 days, followed by 80 to 90 days at 5º C (41°F).  Fresh green seeds have a higher germination rate than the hardened dry seeds and the green seeds will germinate the following spring.

Cuttings taken from mid to late spring up to 200 mm (8 in) long and a place in a media composed of perlite and peat moss.  

After roots appear the cuttings require a dormancy period until spring when they should be pot up. Cuttings can be difficult and unreliable and cultivars are normally grafted onto seedling stock.

Botanic information
Leaf: The blue green leaves are ovate to ovate elliptical up to 35 mm (1⅜ in) wide and have a brownish tinge when unfolding. The apex is acuminate and the base is rarely shallow cordate with a slender petiole up to 12 mm (½ in) long. During autumn the leaves turn warm orange to red before falling and this is an attractive feature of plant.

Flower: The tiny female (Pistillate) flowers consist of perianth segments that are adnate to the ovary with 6-10 teeth along the top and a short style with a linear stigma. They are arranged in loose catkins up to 70mm (2⅔ in) long and the reddish male (staminate) naked flowers have 3-15 stamens and arranged in a pendant catkin up to 80mm (3⅛ in) long They appear during spring.

Fruit: The fruiting catkin is up to 70mm (2⅔ in) long and contains small achene-like nuts that are enclosed in a 3-lobed, papery bract. They appear in pendant bunches and fall from the tree during autumn and the seeds are very viable but the plant may be reproduced vegetatively.