Eryngium Big Blue
Big Blue Sea Holly
Details28-30" tall x 15-18" wide. Fabulous for hot, dry spots 'Big Blue' has green spiky foliage supporting huge 4" diameter bracts that surround the blue center cone. This robust hybrid Sea Holly will entrance you as you watch the silvery bracts and green cones ripen to shades of shimmering blue in mid-summer. An excellent cut flower, fresh or dried. A rugged plant that offers both texture and color to the xeric garden. Drained Soil Plant with Lavender, Echinacea 'Rocky Top'.
|Common Name||Big Blue Sea Holly|
|Botanical Name||Eryngium Big Blue|
|Zones||4, 5, 6, 7, 8, 9|
|Light Requirements||Full Sun|
|Flower Color||Blue, Silver|
|Mature Height||28-30" tall|
|Mature Spread||15-18" wide|
|Bloom Time||Early to late summer|
|Ships As||Potted Plant|
|Soil Type||Sandy Soil, Average Soil|
|Soil Moisture||Drought Resistant / Waterwise|
|Amount of Rain||10 to 20", 20 to 30", 30 to 40" (with care)|
|Advantages||Deer Resistant, Attract Butterflies, Rabbit Resistant|
|Ideal Region||Anywhere In The US|
|Neonicotinoid-Free||Yes - Learn More|
|Ships to Hawaii, Alaska & Canada||No|
Tips For Growing Eryngium (Sea Holly)
Eryngium (Sea Holly) is a genus of Old World perennials with attractive thistle-like flower bracts surrounding the round flowers. Highly attractive to honeybees and butterflies.
Preferred growing conditions:
- Plant in a fast-draining, infertile soil with full sun. Avoid clay soils. Mulch with gravel or not at all.
- Water regularly the first growing season to establish the plant. Thereafter, infrequent but deep watering is all this plant needs.
- Deadheading is not needed as it will not extend the bloom season or bring the plants back into flower.
- Fertilize lightly in the fall with a half and half blend of Yum Yum Mix and good quality compost.
- Eryngium is a tap rooted plant and does not like to be transplanted once established. Don't divide as tap rooted plants resent having their roots disturbed.
- Seed heads are ornamental and attract seed-eating songbirds.
- These are low care perennials that don't like rich soil or a lot of water; this makes the plants leggy and prone to flopping.
View more Planting Guides, or download our complete Planting Guide for tips on caring for your plants when you receive your order, as well as planting instructions for Perennials, Spring-Planted Bulbs, Fall-Planted Bulbs, Cacti & Succulents, Xeric Plants and more.
Plant Shipping: Buy now and we will ship your order at the ideal planting time for your region. Fall shipping begins the week of September 6, zones 3-4 first. Most plant orders arrive within 3-5 days, or less, of leaving our greenhouses. This prompt delivery is provided without additional express charges.
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Gardening Goods:All non-plant items ship within 2-3 days.
Standard shipping costs are $4.99 and up, depending on the size of the order.
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Comments about High Country Gardens Eryngium Big Blue:
The giant blue sea holly is not as waterwise as the description would lead you to believe. I transplanted two of the plants from an area that was xeric to an area which gets watered every other day. After 6 years they are finally thriving!
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USDA Hardiness Planting Zones
To determine if a plant is sufficiently cold hardy, the USDA created numbered zones indicating winter low temperatures; the lower the zone number the colder the winter.
- If the coldest winter temperature expected in your area is -15°F (zone 5) then any plants rated zones 3-5 will survive the winter temperatures in your area.
- If you live in very warm winter areas (zones 9-11) plants with zones 3-4 ratings are not recommended. The lack of freezing winter temperatures do not provide a time for winter dormancy (rest).
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