Because they are constantly pruned into shape they stay relatively small.
Trees for roof decks.
Multi trunk trees are not only trendy but also very suitable for roof gardens.
What trees do well on an urban roof deck.
Hardy to zone 5 kousa dogwood cornus kousa stays small for a tree with some varieties maxing out at just about 30 feet making it an excellent foundation planting for a rooftop garden.
A shrub a hedge an espalier a small tree.
Several species are suitable for patios or decks including lacebark pine pinus bungeana evergreen swiss stone pine pinus cembra and evergreen japanese red pine pinus densiflora.
Grey leaved trees do well on a roof.
In spring the tree has small but beautiful white to pink flowers which transition to deep green summertime foliage.
As a patio tree trained with a single trunk and a roundish top it s delicate weepy graceful deep green and very easy to grow.
Topiary trees not to be confused with trained trees are often also a good option.
Luckily there is plenty of choice.
In large containers consider growing evergreen mugo pine pinus mugo or evergreen japanese black pine pinus thunbergiana.
They are highly visible from the roof and even the ground and they are almost always used on green roofs that will be accessible amenities such as plaza decks roof gardens and healing gardens providing a dynamic and unique space on a rooftop.
For color all year choose small slow growing evergreen trees for rooftop gardens.