Later it was rediscovered by another Scottish botanist called David Douglas in the 19th century and it was after him that the tree was named. It was he who first introduced the tree in England.
These trees are tall, and they are broader than the Spruce tree. They usually bloom during mid spring and usually grow to a height of 50 to 250 feet. The branches of these trees often spread for around 10 to 25 feet and they can live for at least 1300 years. They are including in the list of fast growing evergreen trees.
The leaves of these trees are soft, flat and linear, and they encircle the branches completely. The leaves are blue-green in color and some can also be dark green in color. Each of these leaves have a needle which is around 2 cm in length. The cones of these trees usually hang down, instead of sticking up.
They are mainly found in the foothills of the Rocky mountains. One major fact that one must keep in mind is that although they are called fir tress, they are actually not fir trees and that they are not members of the genus Abies.
Diseases and Care
They are used as food plants by the larvae of insects like bordered white, turnip moth, the engrailed. They also suffer from fungal diseases, which if not treated, can kill the tree.
- Tattering of the leaves
- Formation of powdery mildew
- The trunk of the tree starts to rot.
- The roots starts to suffer from a disease called charcoal disease.
- Cankers on the trees.
While planting the seeds, make sure that the soil is well drained and that it does not retain much water, otherwise the excess water in the soil might damage the roots. While planting the saplings, spray some animal repellent spray so that deer, rabbits, mice, etc. stay away from the plant.
One has to water the sapling daily, specially after planting, for at least three consecutive days. After that water it on a weekly basis. After 6 or 7 weeks of planting the sapling, add fertilizers to the soil. In order to keep pests and other insects away, you can use natural or chemical pesticides.