Eryngium, commonly known as Sea Holly, theare useful in a dry form for Christmas decoration, when, apart from their natural colour, which varies from silver-grey to steel blue, they look well when painted or gilded.
The plants must be given a sunny situation and a really good, deeply moved soil, since their thong-likego down deeply, but they are adaptable, in that given plenty of room for their roots they will grow in almost any type of soil. Because of their unusual habit they always look well when planted in the border. It is best to by taking , 2 or 3 in. long, and inserting in a sandy soil, either in boxes or under the cold frame.
As to varieties, E. alpinum, growing 4 ft high, is particularly good, with steel-blue, cone-shaped heads, having many well-divided, attractive bracts at their base. E. oliverianum, which grows to between 3 and 4 ft, has well-branchedand large bright steel-blue cones. Eryngium planum is another good sort, with rather smaller cones, while E. tripartitum is a most vigorous, free-flowering species, producing an abundance of very well-branched , which make the plants, of up to 4 ft in height most attractive with their shiny blue cones.