The Development of Arnica

Conditions for the Development of Arnica :

DSC_6646hdArnica montana is a “diva;” its requirements in terms of altitude, soil and climate mean it doesn’t grow just anywhere.

Arnica montana, or mountain arnica, likes acidic, siliceous, non-calcareous soil (pH between 5 and 5.5). It also needs land with a slope of at least 3°, which prevents stagnant moisture (which is too humidifying) and ensures satisfactory water circulation. “Arnica is a diva because it needs water, but not too much,” explains Françoise Merceron, pharmacist and head of plant purchasing for Laboratoires Boiron.

Sensitive to sudden and significant temperature variations, Arnica montana grows in high-altitude meadows (at more than 800 m) in the mountainous regions of Central Europe, from southern Sweden to northern Spain.



In France, it is mainly found:

• in the East, inVosges (where the granitic soil is particularly favourable to Arnica), in the Alps, and, much more rarely, in Jura;
• in the Centre, in Morvan, Central Plateau and Cevennes;
• and in the Southwest, in the Central Pyrenees.



Arnica montana flowers between May and August, depending on the levels of vegetation. It is a summer flower that typically blooms around the feast of Saint John (summer solstice), but also as late as August.