In situations where there is limited space for growth in the ground due to existing underground infrastructure, planting trees in containers can be a solution. This greenery softens the urban environment and enhances the experience and biodiversity.

What should you keep in mind when planting trees in containers?
• Choose a container that provides the trees and/or shrubs with enough room to grow.
• Make sure the interior is insulated
• Make sure the soil in the container has the right composition
• Set up an irrigation system, possibly supplemented with a soil moisture sensor.

Species suitable for planting in tree planters include Parrotia persica (Persian ironwood) and Gleditsia triacanthos ‘Sunburst’ (honey locust). These species are available as standard trees, multi-stemmed trees, and solitary trees. These species offer ornamental value throughout the year. Adding groundcover perennials to the tree planter enhances its ornamental appeal. Consider ornamental grasses, various geranium cultivars, or species from the mint family (Lamiaceae) to give biodiversity an extra boost.

Possible species for coastal tree containers include Pinus sylvestris (Scots pine), Pinus nigra subsp. nigra (black pine), sea buckthorn (Hippophae), and olive willow (Elaeagnus).