Even in our climate, the North American, fast-growing trees of the walnut family are reliably winter hardy. They need a sunny place with constandly moist and nutritious soil. The pinnate leaves of this deciduous tree are long and give shade to your garden. In autumn, they change colour into a mixture of yellow and orange. The self-fertile flowers are hanging catkins that unfold in late spring. Female and male flowers on one tree sometimes do not open at the same time, so it is best to grow a second variety for wind pollination in the vicinity.