Eryngium alpinum - Sea holly

continental : They prefer locations where they can receive direct sunlight for at least few hours.
Normally these are very rustic plants, therefore can be grown in the garden all year long.

alpine : It is advisable to place these plants in a very bright location, exposed to direct sunlight.
The Eryngium alpinum are rustic plants, they can tolerate without any problem also intense frosts; during particularly rigid winters cover the aerial part with frost cloth.

mediterranean : Place these plants in a very bright location, possibly exposed to direct sunlight.
They are very rustic plants, that do not suffer from cold.

Fertilization Eryngium alpinum : Medical plants are fertilized from March to October, using a universal fertilizer; we can opt for a slow-release fertilizer, to be given every 3-4 months.

continental : It is advisable to water regularly, specially during the hottest months of the year, avoiding to leave the soil dry for very long periods; the Eryngium alpinum like slightly humid substrates all year long. In autumn and winter you can avoid watering, or intervene during warmest days only.

alpine : Try to keep a mostly humid soil, remember to water generously specially in summer; we can avoid watering during the cold season, or decrease waterings, intervening only in case of long duration drought.

mediterranean : Water the Eryngium alpinum rather regularly from March to October, always allowing the soil to dry out well between two waterings. Avoid water excesses or stagnating water; during the cold season waterings can be decreased or suspended.

Treatments Eryngium alpinum : When spring starts we can apply a sulphur fungicide treatment; the other treatments will be applied only in case the parasites are on the plants. Avoid the use of any treatments on the plants during bloom, which can injure the bees.

Eryngium alpinum - Regina delle Alpi, Cardo azzurro