Amphibious bistort
Persicaria amphibia · Polygonaceae
The gardener's calendar
Ideal time to plant amphibious bistort: set it out when the soil is neither frozen nor waterlogged, and water generously as it establishes.
ID card
- Foliage
- Deciduous
- Flowering
- July to September
- Adult size
- 30 to 80 cm tall
- Growth
- Fast
- Hardiness
- Very hardy (down to -15°C)
- Origin
- Europe, temperate and subtropical Asia
- Soil type
- Moist to marshy, pH indifferent
Care
Watering
Amphibious bistort loves moist environments and can tolerate partial or temporary submersion. Keep the soil constantly fresh or moist, especially during the growing season. In pots, water regularly without allowing water to stagnate permanently; in basins or marshy areas, it develops ideally.
Light exposure
Place the plant in full sun or partial shade for optimal flowering. It adapts well to partial shade, but flowers more abundantly with at least 4 to 5 hours of direct sunlight per day.
Soil
Amphibious bistort thrives in soil rich in organic matter, constantly moist or aquatic. It tolerates any soil type (acidic, neutral or alkaline) as long as it remains moist. Amending it with compost or peat promotes growth in containers.
Pruning and cutting
This herbaceous plant requires no structural pruning. Cut the stems back to ground level in late autumn or early spring to encourage vigorous new growth. Remove spent flowers to extend blooming.
Fertilizer
A spring application of well-decomposed compost is generally sufficient. In fertile, moist conditions, the soil's natural nutrient supply makes additional fertilizers unnecessary. Limit excessive nitrogen inputs which could favor foliage at the expense of flowering.
Diseases and pests
Amphibious bistort is rarely susceptible to major diseases. Occasionally check for aphids or mites, especially in dry conditions. A well-humidified environment limits risks; in case of infestation, a water spray is often enough.
Did you know?
Amphibious bistort is a remarkable amphibious plant capable of growing in both moist terrestrial environments and completely submerged underwater, even modifying the shape and texture of its leaves according to its habitat. This extraordinary adaptability makes it a key species in marshy areas and fluctuating banks. Used since antiquity in temperate wetlands, it is one of the rare herbaceous plants capable of rapidly colonizing aquatic spaces.
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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- Maidenhair vineMuehlenbeckia complexa
- Red bistortBistorta amplexicaulis
Tips generated and checked by Viridia — adapt them to your local climate.