Choosing the most suitable trees for your property is probably one of the most important gardening decisions you will ever make. When it comes to shrubs, it is much easier to remedy a poor choice or badly positioned plant. On the other hand, investing in a tree means that you may only realise five years later that it is inappropriate for your garden or that you have positioned it incorrectly. In a big garden this may cause you some annoyance, but in a garden where there is only enough space for one or two trees, this can be a real disaster.
So, before choosing a tree, ask yourself what purpose you want the tree to fulfil in terms of the overall garden design. Do you need to screen an unpleasant view or focus the eye on a more attractive distant view? Do you want a tree for the kids to climb or in which you can build a swing or a tree house? Do you need shade in summer? Or do you just want to find the ideal tree for the delight of your soul?
Deciduous or evergreen?
Evergreens can be a real liability in a small garden, as the shade they cast in winter can make the garden dark and dank and make your house feel unnecessarily cold. Generally speaking, evergreens should not be planted on the northern or eastern aspect of the house, as they will deprive you of much needed winter sun. However, they make great screeners and windbreaks.
Here are a few specimens that are suitable for planting in a small garden:
Camellia japonica varieties:
Glossy green foliage, winter and early spring flowering, tolerate cold gardens, relatively slow growing, like acid soil and need regular watering in dry weather. My favourite varieties are Debutante (pink flowers), Elegans (rose pink), Kramers supreme (double red), Can Can (pink edged with red), Nobilissima (white), Shiro Chan (white).
Conifers:
Thuja orientalis ‘Golden Rocket’
Columnar shape and fine yellow colour
Juniperus scopularum ‘Skyrocket’
This very slim pencil-shaped cultivar may reach 7 metres in height. It has blue-grey foliage
Chamaecyparis lawsonia
‘Columnaris Glauca’ is also a tall conifer, but has a very attractive, wider, shape.
There are also many wonderful varieties of palms that are worth considering.
Many varieties of deciduous trees are suitable for a small garden. Some of the best are the ornamental fruit tree varieties. My most favourite is the Prunus serrulata ‘Kanzan’. It flowers spectacularly in late spring with large double pink flowering clusters that last for at least a month and it has wonderful autumn foliage that makes an excellent mulch. Being a fruit tree variety, this tree can be shaped to suit your preference. It is really breath-taking when in flower and is suitable for small children to climb to their hearts’ content.
The ‘Kanzan’ variety seems to do particularly well in the Johannesburg area.
‘Shirofugen’ has white blossoms and seems to prefer a colder climate to give its best performance, so it will do well on the east and west rand. Another Prunus variety is ‘Pollardi’. It has lovely pink flowers and rich red summer foliage.
For cool gardens the Acers (maples) with their decorative foliage and lovely autumn colours are a good choice. Best varieties are Acer buergerianum, Acer palmatum.
Ginkgo biloba is slow growing and slim, but will eventually grow to a tall tree has lovely yellow foliage in winter.
For those of you who would like to plant an indigenous tree, Dais cotinifolia is a slim tree with greyish green leaves and pink pompom-like flowers. Combretum kraussi is a fast growing climber and has attractive wine red autumn colouring.
Preparation and position is vitally important
All trees should be planted in a large, well-prepared hole with added superphosphate and compost. In windy areas they may need to be staked until they are well rooted. Remember to allow enough space in all directions for trees to grow and spread. They should always be planted at least 1,5 metres away from walls to allow for proper growth and symmetrical development.
When to plant?
In general, late summer or early autumn is the best planting time, as the moist, warm soil allows the roots to grow, while the dropping night temperatures prevent any rapid growth. Then your tree will already be well rooted by the time spring arrives and encourages strong growth spurt.
However, I generally select my camellias in winter when they are in flower, so that I can be sure of getting the variety that I really want.