Pistacia chinensis

A rounded deciduous tree of the cashew family that grows up to 11m tall and 9m wide naturally, however, it can be kept smaller with pruning.

This tree has dark green pinnate leaves that are aromatic when crushed. In autumn the foliage colour is variable with the onset of cooler temperatures with the leaves turning yellow orange and red. There are separate male and female plants. Flowers are green and insignificant. Red-blue fruits form following flowering but are inedible.

Prefers full sun and well-draining soil but will tolerate a wide range of environments. These include heat, drought, sandy soils, salt-laden winds and cold temperatures.

Always choose healthy well grown plants and plant after autumn rains as the soil is moist and warm and allows plants to become established before winter. This enables them to withstand dry periods during the following summer. Young plants may require thorough watering during dry periods over the first two or three years. Mulching helps to conserve moisture and suppress weeds. Planting success is often improved on clay soils by adding extra topsoil and raising beds. Incorporate coarse sand bark compost or other organic material to improve soil structure.

Before planting ensure the root ball is saturated and remove the planter bag or pot with minimal root disturbance. Trim any broken roots and plant at the same level as in the container. Dig a hole twice the diameter of the root ball and firm in and water once planted. Make sure plants are watered well until established if planting in a drier period. Plant with some general slow release fertiliser and then every spring apply an organic based fertiliser such as blood and bone at a handful per square meter as new growth begins.

Staking may be necessary for some trees which appear unstable and newly planted trees will require watering during dry periods. Tall plants and those in windy positions require staking to stabilize the root ball until established. Position the stakes in the hole before planting and place the plant between them. Long term slow release fertilisers may be added at this stage. As soil is placed in the prepared hole tread firmly to bring soil in close contact with the root-ball. Use wide ties that hold securely without chafing. Tie firmly but allow room for the trunk to increase in girth without constriction. This allows the plant to move a little in the wind encouraging the development of a strong root system without the risk of chafing or root damage. Unless the soil is very wet water thoroughly making sure that moisture penetrates to the depth of the root-ball.

Mulching annually helps suppress weeds and conserve moisture. Organic materials such as sawdust and bark contribute to soil structure as they decompose but keep deep mulching material away from the main stems They benefit from a dressing (50g/m2) of general purpose fertiliser in early spring as new growth begins this will encourage more vigorous healthy growth. Sprinkle evenly and work into the top 2 to 3cm of the soil taking care not to damage surface roots.

The first summer and autumn after planting is critical for young plants; water thoroughly during dry periods. Pests and diseases can have serious debilitating effects on young plants so check regularly.

Proper pruning in the early years is necessary to create a symmetrical tree with good form.

Check stakes and ties for chafing and constriction and remove as soon as plants are strong enough to withstand winds without damage.

No pest and disease issues. Susceptible to verticillium wilt.

Urban Trees