Eastern poison ivy
Toxicodendron radicans · Anacardiaceae
The gardener's calendar
In autumn, ease off feeding and take the chance to clean up around eastern poison ivy and prepare for winter.
ID card
- Foliage
- Deciduous
- Flowering
- Spring (April-May), discreet greenish-white flowers
- Adult size
- 1.5 to 4 m in height depending on conditions
- Growth
- Fast to moderate
- Hardiness
- Very hardy, down to -30 °C
- Origin
- North America (East and Central regions)
- Soil type
- Undemanding, tolerates poor and dry soils
- Toxicity
- All parts contain urushiol (powerful skin allergen)
Care
Light and environment
Toxicodendron radicans thrives in sun or partial shade. It appreciates bright exposure but tolerates partial shading well. Look for a spot where it gets at least a few hours of direct light for optimal growth and beautiful fall foliage color.
Soil and drainage
This plant is undemanding and adapts to most soils: sandy, loamy, or clay. Good drainage is still recommended to prevent root asphyxiation. Acidic to neutral soil is ideal, but it also tolerates slightly alkaline soils.
Watering
Once established, this plant is very drought-tolerant and requires little watering. Water regularly during the first year after planting to encourage root development. After that, water only during prolonged periods of summer drought.
Pruning and training
Pruning is generally unnecessary, as the plant naturally grows in a bushy shape. If you wish to contain it or remove dead wood, do so in late winter or early spring. Wear gloves and full protective clothing, as the sap remains irritating even on dry wood.
Fertilization
No fertilizer is essential for Toxicodendron radicans. In poor soil, a moderate application of well-decomposed compost in spring can boost growth, but the plant does very well in low-fertility soils.
Pests and diseases
This plant is robust and rarely affected by notable pests or diseases. Its vigorous root system and general resistance make it a relatively trouble-free shrub from a phytosanitary standpoint. No specific treatment is usually required.
Did you know?
Toxicodendron radicans is notorious in North America for being one of the most allergenic plants: its urushiol, an oily compound present in all its parts (leaves, stems, roots, and even dead wood), causes severe dermatitis in the majority of people upon contact. Paradoxically, certain birds consume its berries without issue, making them important dispersers of the plant. In autumn, its foliage turns to brilliant scarlet tones, which dangerously makes this plant an attractive sight—one you should definitely avoid.
Where to buy it
Best planted in autumn so the roots settle in before summer, or in early spring once the frost has passed. Pick a plant with healthy foliage and roots that are not exposed. Best time: March, October, November.
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Tips generated and checked by Viridia — adapt them to your local climate.