Eryngium aquaticum, commonly known as water eryngo or water thistle, is a perennial herbaceous plant native to wetlands and marshy areas of North America. Its botanical name "aquaticum" reflects its preference for moist environments. Here's a detailed description of its key characteristics:
Appearance: Water eryngo typically grows to a height of about 2 to 4 feet (60 to 120 cm). It features basal rosettes of long, lance-shaped, deeply lobed leaves with prominent veins. The leaves are often bluish-green or grayish-green in color and can be quite prickly or spiny along the margins.
Stems: The plant sends up stout, upright stems that are often branched towards the top. These stems are ridged and covered with spiny projections, similar to the leaves.
Flowers: Eryngium aquaticum produces distinctive globular flower heads atop the stems. Each flower head is composed of numerous tiny, closely packed flowers arranged in a spherical or oval shape. The flowers themselves are usually white or greenish-white in color, with a tinge of blue or purple.
Blooming Period: The flowering period typically occurs during the summer months, from late spring to early autumn, depending on the local climate.
Habitat: As its name suggests, water eryngo is primarily found in habitats with moist to wet conditions, such as marshes, swamps, ditches, and along the edges of streams or ponds. It thrives in areas with consistently moist soil.
Ecological Role: In its native habitats, water eryngo plays a role in supporting various wildlife species, including pollinators such as bees and butterflies. Additionally, the spiny foliage may provide some protection for small animals seeking shelter. Hardy in zones 6-9.