The Silver Pine is a conifer native to North America; it loves fresh and humid soils, therefore it needs regular watering, especially during the summer season and in the case of particularly young specimens, or those which have been planted for a short time. These are trees which, with the passing of time, can become majestic, even if in Italy they tend to keep within a fairly small size, almost never exceeding the 3-4 metres of height.
Trees that have been planted for a long time can stand short periods of drought, but it is always advisable to ensure that the soil never stays dry for long. From April to September it is advisable to water every time the soil is well dry, but avoiding excessive watering. During the cold months it is not necessary to water, as the plants are in partial vegetative rest and the climate is however cool and humid.
The cultivation of silvery pine
The silvery pine is particularly appreciated in gardens around the world, thanks to its leaves that show a silver-grey color, which under sunlight seem almost blue, the silvery pine is in fact also known as Blue Fir. It is a very decorative plant, which keeps the foliage throughout the year. It is cultivated in a very well drained soil and, after some years from the planting, tends not to need great care.
Pruning must be reduced to a minimum, periodically removing only the branches broken or damaged by the weather. Conifers, in fact, do not like any kind of pruning and tend, with the time, to maintain a graceful and pleasant appearance, constituting a thick cone with horizontal ramifications, at times slightly turned downwards. There are several varieties of silvery pine on the market, some of which are particularly compact and do not exceed one metre in height.
The dwarf varieties are also used in mixed borders or flowerbeds.
- Watering must first be regulated on the basis of the age of the specimen; the younger trees, in fact, have a greater need for water than the adult ones, and fear much more than it is the case.
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Fertilize the tree
The Silvery pine is a very slow growing conifer, which usually doesn’t need a regular fertilization. When planting a silvery pine, it mixes pelleted manure with the growing soil, in order to stimulate the development of the roots and to provide a soft and fairly crumbly soil. During the development of the tree, which can last several decades, small doses of slow release granular fertilizer are provided, to be spread at the base of the stem once a year, at the end of winter.
Other types of fertilization are not necessary even if the silvery pine tends to prefer fairly acidic soils; for this reason it may be useful to mix the soil at the base of the plant with specific soil for acidophilic plants, which helps to lower the pH of the soil.
Silvered pine: Pests and diseases
When grown under ideal conditions for its development, the Silver Pine tends not to be attacked by any kind of parasite. It is a conifer that likes a cool climate and sunny locations. To obtain this type of environmental condition in Italy it is advisable to plant the Silver Pine in a soil located in the middle of the shade, sheltered from the sun during the hottest hours of the day.
The summer climate favours the spread of mites and cochineals on the plant, which can lead to the yellowing of some needles. To eradicate these parasites, the entire canopy must be sprayed with insecticides and acaricides, which is only possible with young specimens or dwarf varieties. The silvery pine can also be affected by rust, which requires treatment with copper-based antifungal products.
- The generic name Colorado fir indicates a genus with about ten species of evergreen trees, origin
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