Giant Sea Holly
Eryngium pandanifolium

Family: Apiaceae (ay-pee-AY-see-ee) (Info)
Genus: Eryngium (er-RIN-jee-um) (Info)
Species: pandanifolium (pan-dan-uh-FOH-lee-um) (Info)

Category:

Perennials

Foliage Color:

Unknown - Tell us

Bloom Characteristics:

Unknown - Tell us

Water Requirements:

Average Water Needs; Water regularly; do not overwater

Requires consistently moist soil; do not let dry out between waterings

Where to Grow:

Unknown - Tell us

Height:

4-6 ft. (1.2-1.8 m)

6-8 ft. (1.8-2.4 m)

Spacing:

36-48 in. (90-120 cm)

Hardiness:

USDA Zone 8a: to -12.2 C (10 F)

USDA Zone 8b: to -9.4 C (15 F)

USDA Zone 9a: to -6.6 C (20 F)

USDA Zone 9b: to -3.8 C (25 F)

USDA Zone 10a: to -1.1 C (30 F)

USDA Zone 10b: to 1.7 C (35 F)

Sun Exposure:

Full Sun

Danger:

Plant has spines or sharp edges; use extreme caution when handling

Bloom Color:

Pale Green

Maroon (Purple-Brown)

Bloom Time:

Mid Summer

Late Summer/Early Fall

Mid Fall

Foliage:

Evergreen

Other details:

Unknown - Tell us

Soil pH requirements:

6.1 to 6.5 (mildly acidic)

6.6 to 7.5 (neutral)

7.6 to 7.8 (mildly alkaline)

Patent Information:

Non-patented

Propagation Methods:

From seed; winter sow in vented containers, coldframe or unheated greenhouse

From seed; sow indoors before last frost

Self-sows freely; deadhead if you do not want volunteer seedlings next season

Seed Collecting:

Allow seedheads to dry on plants; remove and collect seeds

Properly cleaned, seed can be successfully stored

Regional

This plant has been said to grow in the following regions:

Florence, South Carolina

Gardeners' Notes:

0
positives
1
neutral
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RatingContent
Neutral

On Apr 25, 2005, saya from Heerlen
Netherlands (Zone 8b) wrote:

A very ornamental plant also known as E. decaisneanum. It is widespread in South America preferring marshes and wet fields. Basal rosettes of sword like leaves up to 2.5m long give rise to a branching scape to 4 meters high studded with numerous reddish purple flower heads. It is not very hardy outdoors but has survived temperatures down to -10c when grown in a very well-drained soil and a sheltered position.
Plants should be put in their final position whilst small since they resent root disturbance. The plant prefers acid, neutral and basic (alkaline) soils and can grow in very alkaline soil. It cannot grow in the shade. It requires dry or moist soil.
Seeds are best sown as soon as it is ripe in early autumn on the surface of a well-drained compost in a cold frame. The s... read more