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Alpine Sea Holly

Category:

A highly ornamental and drought tolerant selection perfect for summer beds, borders and rock gardens; featuring sturdy stems of steel blue cone-shaped flowers surrounded by deeply toothed and cut silvery leaves; excellent in fresh or dried arrangements

Characteristics

Average Landscape Height:
32 inches
Average Landscape Width:
18 inches
Growth Rate:
fast
Genus:
Eryngium
Species:
alpinum
Flower Color:
steel blue
Flower Period:
from early to mid summer
Summer Foliage Color:
silver blue
Minimum Light:
full sun
Maximum Light:
full sun
Minimum Moisture:
dry
Maximum Moisture:
average
Plant Form:
mounded
Canopy:
low
Pruning:
spring cleanup
Pollution Tolerance:
high
Branching:
herbaceous
Spacing:
15 inches
Flower Form:
ball

Ornamental Features

Alpine Sea Holly features bold steel blue ball-shaped flowers with silvery blue bracts at the ends of the stems from early to mid summer. The flowers are excellent for cutting. Its attractive spiny lobed leaves emerge steel blue in spring, turning silvery blue in color throughout the season. The navy blue stems are very colorful and add to the overall interest of the plant.

Landscape Attributes

Alpine Sea Holly is an herbaceous perennial with a mounded form. Its relatively fine texture sets it apart from other garden plants with less refined foliage.

Planting & Growing

Alpine Sea Holly will grow to be about 32 inches tall at maturity, with a spread of 18 inches. When grown in masses or used as a bedding plant, individual plants should be spaced approximately 15 inches apart. It grows at a fast rate, and under ideal conditions can be expected to live for approximately 3 years. As an herbaceous perennial, this plant will usually die back to the crown each winter, and will regrow from the base each spring. Be careful not to disturb the crown in late winter when it may not be readily seen!

This plant should only be grown in full sunlight. It prefers dry to average moisture levels with very well-drained soil, and will often die in standing water. It is considered to be drought-tolerant, and thus makes an ideal choice for a low-water garden or xeriscape application. It is particular about its soil conditions, with a strong preference for poor, alkaline soils, and is able to handle environmental salt. It is highly tolerant of urban pollution and will even thrive in inner city environments. This species is not originally from North America.

Alpine Sea Holly is a fine choice for the garden, but it is also a good selection for planting in outdoor pots and containers. Because of its height, it is often used as a 'thriller' in the 'spiller-thriller-filler' container combination; plant it near the center of the pot, surrounded by smaller plants and those that spill over the edges. It is even sizeable enough that it can be grown alone in a suitable container. Note that when growing plants in outdoor containers and baskets, they may require more frequent waterings than they would in the yard or garden.

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