Sea holly is part of the Eryngium genus. Its scientific name is Eryngium planum.
Eryngium is a thistle type plant, that has spiky, purple, dull green leaves stems flowers and bracts.
It can tolerate drier conditions and poorer growing conditions than other border or cottage garden plants
Blooms appear in these approximate colours: Purple taupe and Hunter green and Midnight blue. When mature, blooms are roughly 2.5 cm (that's 0.97 inches in imperial) in diameter. Leaves appear approximately as a Hunter green and Prussian blue
It is a flowering non-edible ornamental / flower that typically grows as a perennial, which is defined as a plant that matures and completes its lifecycle over the course of three years or more.
Sea holly is known for growing to a height of approximately 1.46 feet (that's 45.0 cm in metric) with a clump-forming habit. This plant tends to bloom in mid summer.
This plant is a great attractor for bees, so if you are looking to attract wildlife Sea holly is a great choice.
Sea holly is normally quite a low maintenance plant and is normally very easy to grow - great for beginner gardeners!
This plant info is provided by the myfolia gardener's wiki. All details about Sea holly have been kindly provided by our members.
Established clumps ca be divided in the spring
Try to plant in a location that enjoys full sun and remember to apply water fairly sparingly. Use Zone 4 - Zone 8 as your guideline for the appropriate climate for this plant. Keep in mind when planting that Sea holly is thought of as hardy, so this plant will survive close to or on freezing temperatures.
See our list of companion Plants for Sea holly to see which plants you should plant in close proximity to encourage growth.
Can be grown from seed but it easier to divide an established clump in the spring. Use potting compost mixed equally with vermiculite to improve drainageSoil temperature should be kept higher than 10°C / 50°F to ensure good germination.
By our calculations*, you should look at sowing Sea holly about 56 days before your last frost date .
Choose a bright sunny well drained position in the middle to the back of the border.Ensure that temperatures are mild and all chance of frost has passed before planting out, as Sea holly is a hardy plant.
These estimates for how long Sea holly takes to sprout, grow and harvest are from real observations from real gardeners, right around the world.
Average 75 days | Min 75 days | Max 75 days (1)
Average 80 days | Min 80 days | Max 80 days (1)
Average days | Min days | Max days (0)
Our when to plant Sea holly estimates are relative to your last frost date.
The Latin word “Americana” means “of the Americas”.1
Blue sea holly, Eryngium
Eryngium planum L.