Hairy white-top (Lepidium appelianum)

Hairy white-top

Hairy white-top is easy to remember by its common name and recognizable by its thin spreading stems and cluster of small white flowers in the center. Hairy white-top is an invasive weed in California and the United States.

Scientific classification

Species

Hairy white-top (Lepidium appelianum)

Mustards, capers, and allies

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Perennial

Lifespan

Herb

Plant Type

Spring, Summer, Fall

Bloom Time

Deciduous

Leaf type

20 - 35 ℃

Ideal Temperature

Images of Hairy white-top

Distribution of Hairy white-top

Distribution Map

Hairy white-top is native to central Asian regions and has been introduced to parts of South America. It thrives in various ecosystems within its native major areas, spanning steppes to montane zones. The plant has adapted to new territories, reflecting its resilience and ability to spread outside its original range.

Native

Cultivated

Invasive

Introduced

No species reported

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Hemisphere Trend Curve

Northern

Sorthern

Weed Control

Although it’s a valuable plant for pollinators (and in pepper-making), hairy white-top is a highly invasive perennial plant that reduces crop and pasture quality in grazing areas.

How to Control It

Hairy white-top is often controlled with herbicides, but just one application is usually not effective at controlling the spread. Chemical control is also more challenging when the plant has established itself among planted, valuable crops. Certain species of legumes are sensitive to herbicides and cannot be sprayed. There are some species of livestock that will eat hairy white-top, such as sheep and goats, and thus can help prevent and control its spread. Preventive measures like checking clothes, shoes, and vehicles after going through a field where hairy white-top is present can also help to reduce its spread.

If you opt for herbicide use, consult an agricultural expert to find the best compound and application method for your geographical region. Read the instructions on the product label and follow them carefully. Spray on a windless day to avoid drift.

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Care Guide for Hairy white-top

Every week

Water

Full sun

Sunlight

20 - 35 ℃

Ideal Temperature

Water: Hairy white-top thrives with consistent weekly watering to mimic its native habitat's moisture cycles. It benefits from natural rain outdoors but should be monitored during dry spells to maintain adequate soil moisture, which is crucial for its growth and flowering potential.

Fertilize: Regular fertilization of hairy white-top with balanced fertilizers (equal nitrogen, phosphorus, potassium) promotes health. Use a quarter-strength solution monthly in growing seasons, every two months in dormancy. Apply during watering to prevent root burn and support nutrient absorption while adjusting for seasonal needs.

Pruning: Hairy white-top thrives with early to late spring pruning. Start by removing dead stems to promote health, and thin crowded branches for better air circulation. Post-flowering cuts encourage bushiness and vibrant growth, keeping hairy white-top healthy and attractive. Refer to horticultural guides for techniques.

Propagation: Hairy white-top is resilient and propagates via sowing in a well-draining substrate. Consistent moisture is essential for germination, avoiding waterlogging. Pre-sowing treatments may improve germination rates. After germination, gradual acclimatization to outdoor conditions is crucial before permanent planting.

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Images of Hairy white-top

Distribution of Hairy white-top

Weed Control

Care Guide for Hairy white-top

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