What is eryngium alpinum?
Eryngium alpinum, also known as Alpine Sea Holly or Blue Star, is a permanent plant that comes from Europe. It is generally found in the valleys of the Alps and Jura and has metal blue flowers; Blue-green stems and leaves; and silver documents. Bracts protrude from the base of the floral head, which is shaped as a thimble. The upper leaves have three lobes, while the leaves that are closer to the ground are in the shape of the heart, but both have slightly furious edges. In full cultivation, eryngium alpinum can reach a height of 3 feet (0.9 meters), with a spread of about 2 feet (0.6 meters) wide.
The blue star usually grows in hardness zones of three to eight. The cold temperature of the lower zones normally prevents the growth of eryngium alpinum, but the lack of direct sunlight can affect its development. Eryngium alpinum should be planted in an area that is exposed to several hours of sunlight every day. Gardeners should also take into the Accstrine produced by nearby trees and structures.
eryngium alpinum can prosper in poor soil, but it is recommended to add peat and compost to improve soil conditions. The soil should be well exhausted and sandy for optimal growth and adding fertilizers that are rich in nitrogen can help the development of leaves and documents. In general, liquid fertilizers should be added every 15-20 days, while slow release of fertilizers is usually added to the soil every 3-4 months. Eryngium alpinum is able to prosper in drought conditions and generally prefers less water - for eryngium alpinum usually three glasses of water are sufficient every three weeks.
Blue star can live for many years if it is protected from insect and mold damage. To protect the blue star from insect damage, especially from aphids and scales, apply insecticides in early spring. Without how to control the growth of molds is to prevent its colonization on the blue star by spraying the preventive fungicide on it. Gardeners usually can find an insEkticides and fungicidal products in kindergartens and garden centers.
As soon as the blue star is based in the area, it is difficult to transplant or promote by dividing for Taproot. Root cutting and seed sowing are simpler methods for growing new eryngium alpine. Once the flower blooms, it can be cut and displayed for several weeks or dried and stored. The stem from which the cut is made will also flourish the new flower.