Eryngium giganteum - Sea holly

continental : They prefer locations where they can receive direct sunlight for at least few hours.
These plants do not tolerate temperatures below zero, therefore in winter they are grown in the apartment or in the hothouse.

alpine : It is advisable to place these plants in a very bright location, exposed to direct sunlight.
These plants do not tolerate frosts, not even slight ones; it is advisable to grow them in a sheltered place or in the greenhouse.

mediterranean : Place these plants in a very bright location, possibly exposed to direct sunlight.
We suggest to avoid to expose these plants to winter cold; we can place them in the greenhouse or in a sheltered location, or cover the aerial part with frost cloth.

Fertilization Eryngium giganteum : 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 giganteum 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 giganteum 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.