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Native Plant Alternatives to Isatis tinctoria (Dyers Woad)

Native Plants, Invasive Plants, Isatis tinctoria, Dyers Woad, Glastum, Asp of Jerusalem

Isatis tinctoria, also known as woad or dyers woad, is considered invasive in some parts of the United States, particularly in the western regions. It’s a biennial or perennial herb native to the Mediterranean region in Europe. The plant has been introduced to many areas worldwide primarily for its historical use as a source of blue dye.

The ability of Isatis tinctoria to produce large amounts of seeds and its capability to grow in a range of conditions contribute to its invasive potential.

Invasive populations of Isatis tinctoria can form dense stands that displace native plants and reduce the overall biodiversity. It can be particularly challenging to control due to its long-lived seed bank and the fact that it can regrow from root fragments.

According to the U.S Forest Service, Invasive species have contributed to the decline of 42% of U.S. endangered and threatened species and 18% of U.S. endangered or threatened species. Invasive species compete directly with native species for moisture, sunlight, nutrients, and space. They displace and alter native plant communities, degrade wildlife habitat and water quality, and potentially lead to increased soil erosion.

The federal government has estimated that nearly 25 percent of the 20,000 plant species native to North America are at risk of extinction, many of these through habitat loss. You can help reverse this trend by planting great native plants in your garden.

A plant is considered native if it occurs naturally in a particular region or ecosystem without human introduction. There are many benefits to growing native plants. First, these plants are better adapted to soils, moisture, and weather than exotic plants that evolved in other parts of the world. They need fewer fertilizers and pesticides or use less water. Second, they are unlikely to escape and become invasive, destroying natural habitats. Third, they support wildlife, providing shelter and food for native birds and insects, while exotic plants do not.

Guide Information

Hardiness 4 - 8
Heat Zones 1 - 8
Plant Type Annuals
Exposure Full Sun
Season of Interest Spring (Late)
Summer (Early)
Winter
Native Plants United States

U.S. Native Plant Alternatives to Isatis tinctoria (Dyers Woad)

Aquilegia chrysantha (Golden Columbine)
Mahonia fremontii (Fremont Barberry)
Mahonia trifoliolata (Agarita)
Mimulus aurantiacus (Bush Monkey Flower)
Potentilla fruticosa (Shrubby Cinquefoil)
Verbesina encelioides (Golden Crownbeard)

 

 

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Guides with
United States
While every effort has been made to describe these plants accurately, please keep in mind that height, bloom time, and color may differ in various climates. The description of these plants has been written based on numerous outside resources.

Guide Information

Hardiness 4 - 8
Heat Zones 1 - 8
Plant Type Annuals
Exposure Full Sun
Season of Interest Spring (Late)
Summer (Early)
Winter
Native Plants United States
Guides with
United States

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