This is what mine looked like last year when fall hit. I did plant it pretty late in the season.
Description: Sea hollies resemble teasels, with compact heads of long-lasting, small blossoms surrounded by spiny petals that are actually leaves, or bracts. They belong to the carrot family, as evidenced by their thick taproots. The genus is an ancient Greek name for a species of Eryngium.
Hardy: Zone 3
Bloom Time: July - August
Height: 1' - 3'
Spacing: 1 foot apart
Sun Needs: Full sun
Water Needs: Low
Outstanding Features: Interesting bold look for gardens, spiky leaves make the flowers pop in the garden and your flower arrangements.
Uses: For a bold stroke in the formal garden or a fascinating addition to the wild garden, sea hollies are a good choice. The flowers are not only excellent when cut, they are also valuable when dried for winter bouquets.
Tips: Cut off flower stems when the blooming period ends in autumn. Leave the evergreen leaves.