Giant Sea Holly
Eryngium giganteum
Family: Apiaceae
Giant Sea Holly grows in full sun and prefers well-drained soil. Water needs: Low to moderate.
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How to Grow Giant Sea Holly
Giant Sea Holly growing information includes sunlight requirements of Full sun, soil conditions listed as Well-drained soil with a soil pH of 6.0-8.0, and Low to moderate water needs. The listed hardiness zones are 5-9. For propagation reference, the database lists germination or establishment information for Giant Sea Holly as 14-30 days, with planting or establishment depth listed as 1/4 inch. Days to maturity are listed as 1-2 years.
Plant Overview
Giant Sea Holly (Eryngium giganteum) is listed in the Apiaceae family and categorized as a herbaceous biennial with a biennial life cycle. This profile summarizes growing information for hardiness, light, soil, water, seed starting, maturity, and other available cultivation details. Difficulty is listed as Easy.
- Plant ID
- PLT-3346
- Family
- Apiaceae
- Plant type
- Herbaceous biennial
- Life cycle
- Biennial
- Difficulty
- Easy
Growing Conditions
Giant Sea Holly is listed for full sun conditions. Water needs are listed as low to moderate. The database soil reference is Well-drained soil. The listed soil pH range is 6.0-8.0, and the listed hardiness range is 5-9.
- Hardiness zones
- 5-9
- Sunlight
- Full sun
- Soil
- Well-drained soil
- Soil pH
- 6.0-8.0
- Water needs
- Low to moderate
Seed & Germination
For seed starting, the listed germination time is 14-30 days and the seed depth is 1/4 inch. The listed time to maturity is 1-2 years. Use these values as general reference points and adjust for local climate, seed source, and growing conditions.
- Germination
- 14-30 days
- Seed depth
- 1/4 inch
Harvest & Propagation
- Days to maturity
- 1-2 years
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Growing Reference Note
Plant performance can vary with climate, soil, weather, cultivar, seed quality, and gardening methods. The values on this page are general database reference ranges rather than a substitute for local extension guidance or seed-packet instructions.