by As a seasoned Master Gardener with nearly thirty years of experience, Marie Iannotti has a wealth of knowledge in the gardening industry. She is an outstanding public speaker, the author of three gardening books, a talented plant photographer, and a former horticulture educator at Cornell Cooperative Extension. In addition to being interviewed by Martha Stewart Radio, National Public Radio, and various other publications, Marie has written on gardening for publications all around the country.
Review Julie Thompson-Adolf’s profile to learn more about The Spruce’s editorial procedure. She has over 30 years of expertise in sustainable farming, heritage plant cultivation, year-round organic gardening, and seed beginning.A perennial plant that requires little maintenance is called sea holly. It has dark green leaves that form basal clumps and long flower stems with eye-catching purple-blue flowers that like tiny shining thistles are produced from midsummer to autumn.
Their distinctive bract collar is available in silver, white, green, or bluish-purple, and these flowers contain cones that are either green or blue. The stems can be either green or silvery blue depending on the type of sea holly, and the colours have an intriguing metallic sheen that varies when exposed to sunshine.Previously exclusive, sea holly plants are now found in a variety of garden centres and shops, but in a small selection.
The optimum time to sow mature sea holly plants is in the spring since they develop swiftly and nursery plants that are semi-mature will flower in their first growing season. On the other hand, if you plant sea holly seeds in the late summer or autumn, they will germinate in the spring. These plants are long-lived perennials once they are established.Eryngium planum is the scientific name for sea holly, also known as blue sea holly and star thistle.
It is a perennial herbaceous plant that belongs to the family Apiaceae. The mature size of sea holly plants can reach 2-3 feet tall and 1-2 feet wide. They prefer full sun exposure and sandy, well-drained soil that has an acidic, neutral, or alkaline pH.Their flower colour ranges from blue to purple, and they bloom in the summer and autumn. Sea holly may flourish in USDA hardiness zones 5-9. It is native to Europe and Asia.
