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Lepidium latifolium
broadleaved pepperweed
Lepidium latifolium
Lepidium latifolium, also known as perennial pepperweed or broadleaved pepperweed, is a perennial plant in the mustard family (Brassicaceae). It is native to Eurasia but has become a widespread invasive species in North America and other parts of the world. It's characterized by its rapid growth, extensive root system, and ability to thrive in a variety of habitats, including wetlands, riparian areas, and disturbed sites. The plant can grow up to 1.5 meters tall and produces numerous small, white flowers in dense clusters. Its rapid growth and tolerance to varied conditions make it a successful but often unwanted colonizer.
CategoryDetails
Invasive StatusInvasive Status
Plant TypePerennial plant
Estimated Plant Lifespan5 years lifespan
Sun Requirements6+ hours direct sunlight (Full Sun)
Pollination

Method: Insect

Notes: Primarily pollinated by various insects.

Watering Requirements

Method: Top water

Frequency: Regularly, especially during dry periods. Prefers moist soil, but can tolerate some drought once established.

Notes: Avoid overwatering, which can lead to root rot.

Humidity Requirements

Level: Moderate

Cleaning RequirementsRegularly monitor for pests and diseases. Remove seed heads to prevent unwanted spread.
Temperature Range

Min: -15°C

Max: 35°C

Alternative Namesbroadleafed pepperweed, perennial pepperweed, peppergrass mustard, Tall Pepperweed, Broadleaf Peppergrass, Dittander, perennial peppergrass, tall whitetop, Cardaria latifolia, Lepidium latifolium eulatifoliumlepidium latifolium eulatifolium, Nasturtiastrum latifolium, Crucifera latifolia, Nasturtium latifolium
Eutrochium maculatum
spotted Joe-Pye weed
Eutrochium maculatum
Joe-Pye Weed thrives in similar moist soil conditions as Lepidium latifolium, creating a complementary habitat. Its height and robust nature may also provide some competition, potentially slowing the spread of the pepperweed.
Typha latifolia
broadleaf cattail
Typha latifolia

Cattails compete for resources like water and nutrients in wetland habitats, potentially inhibiting the growth of Lepidium latifolium if already established.

Phragmites australis
common reed
Phragmites australis

Although often invasive, where Common Reed already exists and is managed, it competes for space, light, and nutrients, potentially limiting the spread of pepperweed.

Flea Beetles

Small jumping beetles that chew small, round holes in the leaves, causing damage and potentially weakening the plant. Symptoms include visible holes and leaf discoloration.

Aphids

Small, soft-bodied insects that suck sap from the leaves and stems, causing distortion, yellowing, and stunted growth. Aphids can also transmit plant viruses.

Steps:

    • For seed propagation, collect seeds in late summer or fall.
    • Sow seeds in a well-drained seed starting mix in spring or fall.
    • Keep the soil moist until germination.
    • Transplant seedlings to their permanent location after they have developed several true leaves.
    • For root division, dig up mature plants in early spring or late fall.
    • Divide the root ball into sections, ensuring each section has healthy roots and shoots.
    • Replant the divisions in well-drained soil.

Neem Oil

Effective against aphids and flea beetles, acting as a natural insecticide.

Diatomaceous Earth

Can be used as a physical barrier against flea beetles.