Jade Frost

Jade Frost Care

Eryngium planum

What is the plant

Sea Holly is the one to pick if you are looking for a summery plant that can outlive even the hottest days of the year in full sun in your garden. Its indigo flowers last from July to September and will be a nice addition to your garden in stony or gravel areas. They are great for decoration and will also make nice flower arrangements for the cold season, as you can dry the flowers. They are loved both by gardeners and florists and will surely impress you too, once you decide to adopt it.

Eryngium planum “Jade Frost” is the first variegated Sea Holly plant, and they are a great addition to the garden, as they attract multiple pollinators that will benefit the garden overall. They grow up to 7,8-35 inches (20-90 cm) tall, and as they grow in a bush-like form, they get 8-26 inches (20-60 cm) in width as well. Sea Holly will bloom with pale, cream flowers in the beginning, only for them to turn indigo after a few days. You will also find it by the name of eryngo or spiny coriander, as the flowers cluster together in a spiny-like form. The leaves will remain at the bottom of the plant as it grows, and they have a green-cream coloration with pink margins as the temperature gets colder.

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Humidity

Normal

Lighting

Full Sun

Temperature

10°C - 15°C

Hardiness zone

4a - 8b

Difficulty

Easy

Hibernation

Cold Period

How to Care for the Plant

Water
Jade Frost requires light watering, so don’t worry too much if you forget to give it a good watering from time to time. Allow the soil to dry before watering again. Normal rainfall water should be enough for it to grow if planted outside; however, check the spot where you planted it to make sure it does not have water accumulation.
Pruning
Sea Holly is not an invasive plant, so there is no need for too much pruning. Cut the flowers after the blooming period, so the plant re-purposes its nutrients to prepare for winter.
Fertilizer
Use a slow-release fertilizer once in springtime to help the plant bloom during summer. That should be enough to make the flowers bloom and bring the indigo color pop to your garden.

Disease diagnosis

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Sunlight
Eryngiums are sun lovers, so you can keep it in full sun all summer long without worrying that your plant will get burned. The “worse” way it can be affected is that the flowers start to dry, but that is on a positive note, as they are great botanical decorations or add-ons in flower bouquets.
Soil
Sea Holly is not pretentious when it comes to soil; you can plant it in any type of soil as long as it is well-draining. It prefers sandy, gritty soil. It is also a great plant for soils with higher salt levels in coastal areas, although they usually grow in grasslands in their natural habitat.
Propagation
You can propagate Jade Frost by division, seeds, or cuttings, but the cuttings method is the fastest and most efficient, as division is not always successful because the plant could have a hard time to re-establish. Cut a healthy part of the roots and place it directly into the soil. Do this process in late winter to make sure that the plant has enough time to establish and bloom the next summer.

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Temperature
Jade Frost has its hardiness in the name of being a frost-resistant plant that can thrive in conditions where other plants will start to fade away. It can be kept in temperatures as low as 10 °F (-12 °C), and summer temperatures will be just right for it, so there is no need to worry about temperature levels with this plant.
Container
You can keep this plant in a container, although it is most commonly planted directly in the garden soil. Choose a container that has drainage holes, as Sea Holly is one to enjoy dry, sandy soil.
Fun fact
If you grow Sea Holly, you can already say you have a vegetable garden! Kind of. Jade Frost is part of the Apiaceae family, which is the same family carrots come from and what they have in common is that the root of Sea Holly is edible, along with its young leaves. Some time ago, these roots were candied and sold as a sweet remedy for a sore throat.

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Popularity
473 people already have this plant 183 people have added this plant to their wishlists

Common pests
Slugs and snails are particularly attractive to this plant, so pick them away as soon as you see them and use a mild insecticide to eliminate any eggs from the plant. Aphids are also common pests for Sea Holly, and they will make their presence known by yellowing the plant's leaves. The diluted insecticide should do the job, or you can also rely on natural enemies, such as wasps or ladybugs that are already attracted to Sea Holly.
Frequent diseases
Botanist’s tips