Photo: Roman A. Lagazyuk (Роман А. Лагазюк)CC BY 4.0via iNaturalistresized / cropped
Water Pepper Plant Care
Persicaria hydropiper (L.) Delarbre
Updated · Sources · How we source care data
Known for its long, lance-shaped leaves with a distinct red blotch at the center, this plant originates from Asia and Europe. Plant collectors value Persicaria hydropiper for its unique foliage and its ability to thrive in wet or moist conditions, making it a versatile and eye-catching addition to any garden.
Every 3–5 days
Full sun to part shade
50–80°F
40–70%
At a glance
How do you care for Water Pepper?
Water Water Pepper every 3–5 days, letting the top layer of soil dry out between waterings, and give it full sun to part shade. It prefers temperatures of 50–80°F (10–27°C) and 40–70% humidity. Fertilize it every 6 months during the growing season.
Where Is the Water Pepper Native To?
- Albania
- Australia
- Austria
- Belarus
- Belgium
- Bosnia and Herzegovina
- Bulgaria
- Canada
- Croatia
- Cyprus
- Czechia
- Denmark
- Estonia
- Finland
- France
- Germany
- Greece
- Hungary
- Iceland
- Ireland
- Italy
- Latvia
- Lithuania
- Luxembourg
- Malta
- Mexico
- Moldova
- Montenegro
- New Zealand
- North Macedonia
- Norway
- Poland
- Portugal
- Romania
- Russia
- Serbia
- Slovakia
- Slovenia
- Spain
- Sweden
- Switzerland
- The Netherlands
- Ukraine
- United Kingdom
- United States
What Is the Water Pepper?
Water Pepper (Persicaria hydropiper) belongs to the Polygonaceae family within the Persicaria genus. Water Pepper is native to Australia, New Zealand, temperate Asia, Europe and North America. Water Pepper is also known as Smartweed, Brooklime, Redshank.
Water Pepper displays a spreading, clumping perennial growth habit, reaching up to 1.5 ft tall with a spread of approximately 2 ft. Water Pepper produces small, spiky flowers in various colors.
Leaf size: approximately 4 inches.
How Often Should You Water a Water Pepper?
Persicaria hydropiper requires watering every 3–5 days. Allow the top layer of soil to dry between waterings to prevent root rot. Reduce watering frequency during winter when growth slows.
Watering Frequency
Every 3–5 days
Let soil partially dry between waterings
What Light Does the Water Pepper Need?
Water Pepper thrives in full sun to part shade.
Light Requirement
Full sun to part shade
What Temperature and Humidity Does the Water Pepper Prefer?
Persicaria hydropiper grows best at temperatures of 50–80°F. Water Pepper prefers humidity levels of 40–70%.
Temperature
50–80°F
Humidity
40–70%
What Soil Mix Works Best for a Water Pepper?
Moist, well-draining soil rich in organic matter. Good drainage is essential for Water Pepper to prevent waterlogging, which leads to root rot and fungal issues.
How Often Should You Fertilize a Water Pepper?
Feed Water Pepper every 6 months during the growing season (spring and summer) with a balanced fertilizer diluted to the strength on the label.
Pause feeding in autumn and winter, when growth slows, and never fertilize dry soil — water first.
Fertilizing
Every 6 months
During the growing season
The PlantoScan app can remind you when to water and when to fertilize each plant.
How Do You Repot a Water Pepper?
Repot every 2-3 years in early spring. Choose a pot one size larger than the current container, and ensure it has drainage holes to allow excess water to escape.
How Do You Propagate a Water Pepper?
Water Pepper can be propagated through division, seeds. Similar propagation techniques also apply to water pepper plant care, which shares the same genus.
Is the Water Pepper Toxic to Pets and Children?
Pet safety not verified
The ASPCA does not list Water Pepper, so we can't confirm whether it is safe for cats and dogs. Keep pets from chewing it as a precaution.
This is a general caution, not veterinary or medical advice. If your pet ate a plant, contact your vet or animal poison control.
See all plants toxic to cats and plants toxic to dogs.
What Pests and Diseases Affect the Water Pepper?
Water Pepper is susceptible to aphids, spider mites. Inspect the foliage regularly, especially along leaf undersides and stems. Treat infestations promptly with insecticidal soap or neem oil to prevent spread.
Yellow leaves, brown tips or drooping? See common plant problems and how to fix them.
What USDA Hardiness Zone Does the Water Pepper Need?
Water Pepper grows outdoors in USDA Zone 3a – 10b. It survives winters down to planting zone 3a. Water Pepper is native to Australia, New Zealand, temperate Asia, Europe and North America.
Hardiness Zone
Zone 3a – 10b
Keep exploring plants
Water Pepper is one of many species covered in the complete plant care and identification guide, which groups plants by genus, attribute, and popularity.
It belongs to the Persicaria genus — compare its care with other Persicaria species on PlantoScan.
Persicaria is part of the Polygonaceae plant family — browse all Polygonaceae genera and species.
Water Pepper thrives in bright light and direct sun — see other bright-light plants.
More Persicaria Species
Other Persicaria species in PlantoScan's care catalogue share similar watering, light, and soil preferences:
Sources
- Scientific name & taxonomy: Persicaria hydropiper (L.) Delarbre, family Polygonaceae (first published in Fl. Auvergne , ed. 2: 518 (1800)) — World Flora Online record, IPNI name record.
- Pet toxicity: Pet safety not verified: the ASPCA does not list Water Pepper, so we can't confirm whether it is safe for cats and dogs. Checked against the ASPCA plant list; any other toxicity note on this page comes from PlantoScan's plant database.
- Photo: Roman A. Lagazyuk (Роман А. Лагазюк), CC BY 4.0, iNaturalist — original.
- Hardiness zone: USDA Zone 3a – 10b, estimated from the plant's typical growing conditions.
- Care values(watering, light, temperature, humidity, soil, fertilizing): PlantoScan's plant database, filtered by automatic plausibility checks — values that fail them are hidden. How we source and check plant data.
Spotted a mistake? Email info@upvision.media with the page link — we check and correct reported errors.
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