In recent years, prickly spruce trees are becoming increasingly popular in gardening. That's because these ornamental plants have a special frost resistance, beautiful shape and unusual saturated color. In this article we will get acquainted with one of the types of blue spruce - Koster spruce.
Homeland ate "Bonfire" - Holland. This variety was registered as a new garden form, in 1901, in the city of Boscop. Ari Koster owned the nursery at that time, and this species of blue spruce was named after him.
Despite the fact that the official mention of the Koster spruce is relatively recent, there is reason to believe that this species appeared earlier. In the literature you can find information about the sale of this plant at the end of the XIX century.
Blue spruce "Bonfire" - a beautiful decorative tree. It has the shape of a cone, symmetrical.
- The crown is conical in shape, the crown diameter of an adult plant is up to 5 m, the branches are slightly lowered down. The young plant is characterized by asymmetry due to the rapid growth of the lower branches. However, by the age of 10 it takes on a more regular form.
- The needles are prickly, hard and thick, bluish-green in color, needles up to 25 mm long, covered with a light waxy coating. Coloring is maintained throughout the year.
- Adult spruce "Bonfire" reaches a height of 10-15 meters. After 10 years, it grows to 3 meters, and its diameter is 1.5-2 m. This tree develops at an average speed, grows by 15-20 cm each year. In spring, but not every year, lilac cones can be found on the branches of spruce colors that turn green over time and when ripe become brown.
- frost resistance (an adult plant can withstand temperatures up to -40), drought resistance, resistance to gas contamination, smoke and soot, like light, wind-resistant;
- prefers loose fertile soils (chernozem, loam), soil moisture and degree of fertilizer average, acidity 4-5.5.
Pruning is acceptable (spruce tolerates this procedure well), although it is not required. The branches are strong, do not break under the weight of snow.
It is recommended to plant the blue bonfire spruce in the spring and autumn so that the tree can take root. Spruce "Bonfire" reproduces in three ways:
Consider all the methods in order.
This is the most convenient way of propagation, since you just need to purchase a finished seedling and prepare the land. In order for the tree to grow in the correct shape, it is important to carefully select a place for planting. It is best to choose a site in the sun or in partial shade. In no case can spruce be planted in dense clay soil, otherwise the tree will not be able to take root properly, as it has a superficial root system.
The pit needs to be dug 2 weeks before landing.
After the landing site has been determined, drainage of this area should be done to avoid excessive stagnation of moisture. To do this, crushed stone, expanded clay or tile should be poured onto the bottom of the prepared pit (depth - 60 cm, diameter - half a meter).
The soil from the hole must be combined with additives: sand, peat and humus from the leaves (no more than half a bucket), the ratio of ingredients is 2: 1: 1: 1. Also add 10 grams of nitroammophosphate. After this, pour the mixture into the pit, spill with 5 liters of water, place the seedling, fix the trunk with earth.
If the soil contains a lot of limestone, then the soil can be slightly acidified. For this purpose, ammonium fertilizers are suitable. You can also use horse peat, litter of needles, sawdust and sphagnum moss.
You can grow a Bonfire spruce even from a small branch. To do this, from the top of a 6-8-year-old plant, you need to cut off the part you need (10-20 cm) and clean the lower part of the needles. Cuttings should be prepared in spring or autumn (keep in mind that autumn cuttings take longer to take root). For processing, soak the stalk in a solution of potassium permanganate.
After that, in the prepared hole (the requirements for the soil are the same as for the seedling, but adjusted for the size of the hole), we plant the cuttings at an angle of 30 degrees, fixing the ground. Then watering is required (before rooting several times a day). Then we cover with a film and burlap until the end of summer, and for the winter you need to warm the stalk with sawdust.
This is the most difficult method of reproduction, since it takes 3 years to grow a full-fledged seedling. Seeds need to be collected in winter, they must be treated with a potassium permanganate solution.
After we put the earth with additives in a plastic container and deepen the seeds by 1.5 cm. The seeds must be stored for 3 months in the refrigerator - this will greatly accelerate the process of germination. Then it should be rearranged in a warm place and watered until emergence. After that, you can plant the plants as seedlings, covering with a plastic bottle.
After planting, you must adhere to the following care rules:
- watering: up to one year - several times a day in small portions, a tree up to 10 years - every 2 days, 10 liters;
- pruning: up to 5 years, you need to trim dry yellowed branches, giving the shape of a spruce;
- fertilizing with mineral fertilizers in small quantities up to 5 years;
- treatment from parasites: spraying with the preparations "Decis", "Karbofos";
- treatment for diseases: spraying with colloidal sulfur, Fundazolom, Kuproksatom.
Growing a Bonfire spruce on your own is not easy, but if you follow certain rules, everything will work out.
More about the “Bonfire” fir tree in the video below.