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Description
Senegalia Nigrescens, also known as Knob Thorn, is a deciduous tree that can grow up to 15 meters in height. It is native to sub-Saharan Africa and is commonly found in semi-arid regions. The tree has a wide and round crown, with a thick trunk that can be up to one meter in diameter. Its branches are armed with thorns, which can grow up to 10 cm in length.
Taxonomic Information
| Domain | Eukaryota |
| Kingdom | Plantae |
| Phylum | Spermatophyta |
| Class | Magnoliopsida |
| Order | Fabales |
| Family | Leguminosae |
| Genus | Senegalia |
Appearance
The leaves of Senegalia Nigrescens are bipinnate, with small leaflets that are about 5 mm long. The tree produces fragrant yellow flowers that bloom from August to September, followed by flat and brown seedpods that are about 10 cm long. The bark of the tree is grayish-brown and rough.
Care Guide
Senegalia Nigrescens is a hardy tree that can tolerate drought and poor soil conditions. However, for optimal growth, it is recommended to provide the tree with moderate water, a well-draining soil, and full sun exposure. The tree can be fertilized once a year with a balanced fertilizer during the growing season. It is hardy in USDA zones 9 to 11.
Common Pests & Diseases
Senegalia Nigrescens is relatively resistant to pests and diseases. However, the tree can be affected by anthracnose, which causes leaf spotting and defoliation. Powdery mildew can also occur, which results in a white film on the leaves. Insects such as spider mites and scales can infest the tree, causing leaf yellowing and wilting.
Habitat
Senegalia Nigrescens is commonly found in semi-arid regions of sub-Saharan Africa, including Botswana, Namibia, and Zimbabwe. The tree can grow in a variety of habitats, including savannas, woodlands, and grasslands.
Question and Answer
Q: Is Senegalia Nigrescens an evergreen or deciduous tree?
A: Senegalia Nigrescens is a deciduous tree.
Q: What are the common pests and diseases that affect Senegalia Nigrescens?
A: Senegalia Nigrescens can be affected by anthracnose, powdery mildew, spider mites, and scales.
Q: What is the optimal growing zone for Senegalia Nigrescens?
A: Senegalia Nigrescens is hardy in USDA zones 9 to 11.
Q: What is the average height that Senegalia Nigrescens can reach?
A: Senegalia Nigrescens can grow up to 15 meters in height.
Related Plants
- Senegalia brevispica
- Senegalia burkei
- Senegalia caffra
- Senegalia galpinii
References
- “Senegalia Nigrescens,” PlantZAfrica, South African National Biodiversity Institute, https://www.plantzafrica.com/plantqrs/senegnigres.htm
- “Senegalia Nigrescens,” World Agroforestry Centre, https://www.worldagroforestry.org/treedb2/AFTPDFS/Senegalia_nigrescens.pdf
