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Description
Picea Crassifolia, commonly known as the Thick-leaf Spruce, is a species of coniferous tree that belongs to the Pinaceae family. This evergreen tree is native to western China and is widely planted in parks and gardens across the world. It can grow up to 30 meters in height and has a conical shape with a dense crown. The bark of the tree is grayish-brown and is smooth when young, but it becomes rough and scaly with age. The tree has a shallow root system, which makes it susceptible to wind and snow damage.
Taxonomic Information
| Domain | Eukarya |
| Kingdom | Plantae |
| Phylum | Pinophyta |
| Class | Pinopsida |
| Order | Pinales |
| Family | Pinaceae |
| Genus | Picea |
Appearance
The Thick-leaf Spruce has dark green, needle-like leaves that are about 1-2 cm long and 2-3 mm wide. The leaves are arranged in a spiral pattern along the branches and are stiff and sharp. The tree produces cones that are about 6-10 cm long and 3-4 cm wide. The cones are green when young, but turn brown when mature. The seeds of the tree are small and have a wing-like structure that helps them to disperse in the wind. The Thick-leaf Spruce is a slow-growing tree and can take up to 30 years to reach maturity.
Care Guide
The Thick-leaf Spruce requires regular watering during the growing season, especially during hot and dry periods. The tree prefers well-draining soil that is rich in organic matter. Fertilization can be done once a year, preferably in the early spring. The tree prefers full sun but can tolerate partial shade. It is hardy to USDA zones 4-7.
Common Pests & Diseases
The Thick-leaf Spruce is susceptible to a number of pests and diseases, including spruce spider mites, spruce budworms, and needle cast. Spider mites can be controlled with insecticidal soap or neem oil, while budworms can be controlled with Bacillus thuringiensis (BT). Needle cast can be prevented by ensuring good air circulation around the tree and avoiding overhead watering.
Habitat
The Thick-leaf Spruce is native to western China and grows in montane forests at elevations of 2,500-4,500 meters. The tree prefers cool and moist climates and can tolerate cold temperatures and heavy snowfall.
Question and Answer
Q: Can the Thick-leaf Spruce be used as a Christmas tree?
A: Yes, the Thick-leaf Spruce can be used as a Christmas tree, but it is not as commonly used as other types of spruce trees.
Q: Is the Thick-leaf Spruce a good choice for a small garden?
A: No, the Thick-leaf Spruce is not a good choice for a small garden as it can grow up to 30 meters in height.
Q: Can the Thick-leaf Spruce be grown in containers?
A: Yes, the Thick-leaf Spruce can be grown in containers, but it will require regular watering and fertilization.
Q: Is the Thick-leaf Spruce a fast-growing tree?
A: No, the Thick-leaf Spruce is a slow-growing tree and can take up to 30 years to reach maturity.
Related Plants
- Picea abies (Norway spruce)
- Picea glauca (White spruce)
- Picea mariana (Black spruce)
References
- “Picea crassifolia.” Missouri Botanical Garden. Accessed September 2, 2021. https://www.missouribotanicalgarden.org/PlantFinder/PlantFinderDetails.aspx?taxonid=282010.
- “Picea crassifolia.” PlantFiles. Accessed September 2, 2021. https://davesgarden.com/guides/pf/go/67335/.
- “Picea crassifolia.” The Spruce. Accessed September 2, 2021. https://www.thespruce.com/grow-thick-leaf-spruce-trees-3269347.
