Only a few conifers are naturally shallow-rooted, although their actual root depth and spread depends primarily on the composition and compaction of the soil. Trees tend to root deeper in locations with nutrient-poor, dry soils than in those with humus-rich, moist ones. You can now read why the classification according to root type is so important.
Which conifers are shallow-rooted?
Shallow-rooted conifers include spruce (Picea abies) and arborvitae (Thuja occidentalis). They form a dense root system that extends only slightly in depth and rather in width, making them more susceptible to falling over.
What are shallow roots?
Plants are roughly divided into shallow and deep-rooted plants, with the former forming a densely branched root system that remains close to the surface and only extends slightly into the depths. The size of a tree is not a sign of what type of root it is: the huge prehistoric sequoia trees, for example, are shallow-rooted; their root system often does not extend deeper than one to a maximum of three meters into the earth. However, the shallow root system often spreads over a diameter of many meters.
What problems can occur with shallow roots?
A typical problem with shallow-rooted trees is their often low stability: As a result of a strong storm or after heavy rain, these species can quickly fall over and can then no longer be saved. Furthermore, shallow-rooted plants often need a lot of distance from other plants so that their roots can spread. Caution is also advised when planting near house walls, walls and similar structures, as many a root system has already destroyed these. In contrast to many other plants, shallow-rooted conifers do not develop root runners.
Which species of conifers have shallow roots?
Typical shallow-rooted conifer species are
- Spruce (Picea abies)
- Tree of life (Thuja occidentalis)
However, this also means that both species can easily root in locations with a shallow layer of soil, such as a roof garden. It only becomes a problem when a tall solitaire is exposed to wind and other weather influences without protection. In this case, its stability is only low. For stabilization, planting should be done in a more protected location or mixed group planting, with the different species supporting each other. However, in order for this effect to be used, the required minimum distance must be maintained.
Tip
While it is better not to plant shallow-rooted plants too close to houses and other structures, you should not plant deep-rooted plants over underground lines or pipes. With a bit of bad luck, the roots will destroy the sewage pipes or cables.