Spiny cocklebur
Xanthium spinosum · Asteraceae
The gardener's calendar
Ideal time to plant spiny cocklebur: set it out when the soil is neither frozen nor waterlogged, and water generously as it establishes.
ID card
- Family
- Asteraceae
- Type
- Annual herbaceous plant
- Adult size
- 60 to 150 cm in height
- Foliage
- Deciduous, medium green
- Flowering
- July to September
- Growth
- Fast
- Hardiness
- Low hardiness, temperate to warm climate
- Origin
- South America
Care
Exposure
Plant spiny cocklebur in full sun for optimal growth. It tolerates partially shaded areas reasonably well but remains less vigorous. A well-ventilated location promotes good air circulation and limits fungal issues.
Soil
This plant adapts to many soil types, including poor and disturbed ground. However, it prefers good drainage and tolerates dry soils well. Avoid heavily compacted or permanently wet soil.
Watering
Water moderately during the growing period, especially after planting. Once established, spiny cocklebur tolerates drought well thanks to its deep root system. Reduce watering in autumn and avoid excess moisture.
Fertilizing
Fertilizer is generally unnecessary: this hardy plant thrives in poor soils. If visible deficiency appears (pale foliage), a balanced fertilizer applied at the start of growth should suffice.
Pruning and cutting
As an annual plant, spiny cocklebur doesn't require structural pruning. You can cut back invasive stems to control size or encourage branching. In late summer, remove entire plants after fruiting.
Diseases and pests
Generally robust, this herbaceous plant is rarely subject to serious diseases. Occasionally watch for spider mites and aphids in very dry or hot conditions. Regular watering and good air circulation reduce the risk of fungal problems.
Did you know?
The spiny cocklebur owes its English name to its hispid and spiny fruits, resembling small bristly balls: these spiny bracts cling to clothing and animal fur to disperse seeds over long distances. In South America, its parent plant is historically associated with abandoned lands and disturbed zones, making it a botanical pioneer.
Where to buy it
Plant in spring or early autumn, avoiding spells of intense heat. Pick a plant with healthy foliage and roots that are not exposed. Best time: March, April, May, September.
Add this plant to my garden →Plants from the same family
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- Canadian goldenrodSolidago canadensis
- WormwoodArtemisia absinthium
Tips generated and checked by Viridia — adapt them to your local climate.