Eryngium Giganteum
Great Eryngo; Nat. Ord. Umbelliferæ.
This hardy species was brought from the Caucasus in 1820. The genus, though not commonly patronised as garden subjects, are, nevertheless, highly ornamental, and when well grown much admired. Specimens are of various heights, according to position and nature of the soil; under ordinary conditions they will be 2ft. to 3ft. high at the blooming period.
As will be inferred from the order to which the Eryngium belongs, the flowers are aggregate, of a changeable blue, and arranged in cone-shaped heads 1½in. long; the heads are neatly embraced by an ample bract of prickly leaves; the main flower stem is well and evenly branched (see Fig. 37), each node being furnished with leaves which clasp the stems; they are, like those of the flower bract, deeply cut and prickly; the radical leaves are very different, long stalked, large heart-shaped and toothed, of good substance and a glossy green colour. The whole plant has a rather stiff appearance, the flower stems, together with the stem leaves, are of a pleasing hue, nearly the colour of blue note paper; this is characteristic of several of the genus, and adds greatly to their effect. Specimens look well with a grassy foreground or in borders.
Their culture is easy, provided the soil is of a light nature; a sunny position is needful, in order to have the tops well coloured. Propagate by division of strong and healthy clumps when dormant. Wireworm and grub are fond of the roots; when the plants appear sickly, these pests should be looked for.
Flowering period, August and September.