Rattlesnake master (Eryngium yuccifolium) does have a spreading habit, but it is not overly aggressive or invasive like some other plants. It tends to spread slowly over time, primarily through its root system. The plant forms a deep taproot, which helps it establish and survive in various soil conditions.
In terms of its size, rattlesnake master typically reaches a height of about three to four feet. However, it should be noted that this can vary depending on growing conditions and the specific cultivar of the plant. The spread of the plant is usually around one to two feet, with the foliage radiating outward from the central stem.
I have personally grown rattlesnake master in my garden, and I have found that it tends to form small clumps over time. It is not a plant that aggressively takes over an area or spreads rampantly like some other plants with invasive tendencies. Instead, its spread is relatively contained and controlled.
When it comes to cultivation, rattlesnake master prefers full sun to partial shade and well-draining soil. It is adaptable to a range of soil types, including clay, loam, and sandy soils. However, it does not tolerate wet or waterlogged conditions, so good drainage is important.
In terms of maintenance, rattlesnake master is a relatively low-maintenance plant. It is drought-tolerant once established and requires minimal watering. Additionally, it is relatively pest and disease-resistant, making it an easy-to-care-for addition to the garden.
One interesting aspect of rattlesnake master is its unique flowers, which are an attraction for pollinators such as bees and butterflies. The plant produces spherical, spiky flower heads that are greenish-white in color and resemble small thistles. These flowers add visual interest to the garden and can be enjoyed from mid to late summer.
While rattlesnake master does have a spreading habit, it is not overly aggressive or invasive. It slowly spreads through its root system, forming small clumps over time. Its size typically reaches three to four feet tall with a spread of one to two feet. Rattlesnake master is a low-maintenance plant that can thrive in various soil conditions and attracts pollinators with its unique flowers.