Seymeria pectinata Plant Care
Seymeria pectinata Pursh
Updated · Sources · How we source care data
Seymeria pectinata, commonly called combleaf blacksenna, comb seymeria, or piedmont blacksenna, is a species of annual herb endemic to several states of the U.S. southeast coastal plain.
Every 7–10 days
Full sun to partial shade
60–80°F
40–60%
At a glance
How do you care for Seymeria pectinata?
Plant Seymeria pectinata in full sun to partial shade (USDA zones 13a) and water a young shrub every 7–10 days until it is established. It tolerates temperatures of 60–80°F (16–27°C). Fertilize it every 8 months during the growing season.
Where Is the Seymeria pectinata Native To?
What Is the Seymeria pectinata?
Seymeria pectinata (Seymeria pectinata) belongs to the Orobanchaceae family within the Seymeria genus. Seymeria pectinata is native to Louisiana.
Seymeria pectinata displays a low spreading ground cover growth habit, reaching up to 0.5 ft tall with a spread of approximately 1.5 ft. Seymeria pectinata produces small tubular flowers in shades of pink or purple.
Leaf size: approximately 2 inches.
How Often Should You Water a Seymeria pectinata?
Water a young or newly planted Seymeria pectinata every 7–10 days, soaking the whole root zone, until it is established — usually one to two growing seasons. Established shrubs mainly need water during long dry spells. In a container, water whenever the top few centimetres of soil are dry.
Watering Frequency
Every 7–10 days
Until established; then in dry spells
What Light Does the Seymeria pectinata Need?
Seymeria pectinata thrives in full sun to partial shade.
Light Requirement
Full sun to partial shade
What Temperature and Humidity Does the Seymeria pectinata Prefer?
Seymeria pectinata tolerates temperatures of 60–80°F. Seymeria pectinata prefers humidity levels of 40–60%.
Temperature
60–80°F
Humidity
40–60%
What Soil Mix Works Best for a Seymeria pectinata?
Well-draining sandy soil mix with added organic matter. Good drainage is essential for Seymeria pectinata to prevent waterlogging, which leads to root rot and fungal issues.
How Often Should You Fertilize a Seymeria pectinata?
Feed Seymeria pectinata every 8 months during the growing season with a balanced, slow-release fertilizer at the rate on the label. Established shrubs in good soil often need little extra feeding, so let weak growth or pale foliage guide you.
Stop feeding by late summer so new growth can harden before winter.
Fertilizing
Every 8 months
During the growing season
The PlantoScan app can remind you when to water and when to fertilize each plant.
Where Should You Plant a Seymeria pectinata?
Choose a spot with full sun to partial shade and well-draining sandy soil mix with added organic matter. Avoid low spots where water collects after rain.
Seymeria pectinata is suited to USDA Zone 13a.
Plant container-grown or balled-and-burlapped shrubs in spring or early autumn, setting the root flare at soil level, and water well after planting.
How Far Apart Should You Plant a Seymeria pectinata?
Seymeria pectinata can spread to about 2 ft (0.5 m) and reach about 1 ft (0 m) tall. Space plants about 2 ft (0.5 m) apart so mature crowns don't crowd each other, and plant at least half that distance from buildings, fences and paths.
Planning a row or hedge? Try the plant spacing calculator.
How Do You Prune a Seymeria pectinata?
Prune Seymeria pectinata while it is dormant in late winter: first remove dead, damaged and crossing branches, then thin lightly for shape.
If it flowers in spring, prune right after flowering instead so you don't remove next year's buds. Never take off more than about a quarter of the shrub in one year.
How Do You Care for a Seymeria pectinata in Winter?
Seymeria pectinata is frost-tender (hardy to USDA zone 13). In colder areas grow it in a container and move it to a bright, frost-free place before the first frost.
How Do You Propagate a Seymeria pectinata?
Seymeria pectinata can be propagated through seeds, division of rhizomes. Similar propagation techniques also apply to seymeria cassioides plant care, which shares the same genus.
Is the Seymeria pectinata Toxic to Pets and Children?
Pet safety not verified
The ASPCA does not list Seymeria pectinata, 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 Seymeria pectinata?
Seymeria pectinata 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 Seymeria pectinata Need?
Seymeria pectinata grows outdoors in USDA Zone 13a. It survives winters down to planting zone 13a. Seymeria pectinata is native to Louisiana. In cooler regions, grow Seymeria pectinata as a houseplant or bring it indoors before the first frost.
Hardiness Zone
Zone 13a
Keep exploring plants
Seymeria pectinata 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 Seymeria genus — compare its care with other Seymeria species on PlantoScan.
Seymeria is part of the Orobanchaceae plant family — browse all Orobanchaceae genera and species.
Seymeria pectinata thrives in bright light and direct sun — see other bright-light plants.
Related Plant Care Guides
Closely related plants with similar care requirements:
Sources
- Scientific name & taxonomy: Seymeria pectinata Pursh, family Orobanchaceae (first published in Fl. Amer. Sept. 2: 737 (1813)) — World Flora Online record, IPNI name record.
- Pet toxicity: Pet safety not verified: the ASPCA does not list Seymeria pectinata, 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.
- Hardiness zone: USDA Zone 13a, calculated from the plant's minimum temperature.
- 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.
