Giant fennel Plant Care
Schoenoselinum foeniculoides (Maire & Wilczek) Jim.Mejías & P.Vargas
Updated · Sources · How we source care data
This plant is easily recognizable by its delicate, fern-like foliage that closely resembles fennel. Originally from the Caucasus region, Schoenoselinum foeniculoides is highly sought after by plant collectors for its unique appearance and rarity in cultivation. Its graceful leaves add an elegant touch to any garden or collection.
Every 7–10 days
Partial shade to full sun
50–75°F
40–60%
At a glance
How do you care for Giant fennel?
Water Giant fennel every 7–10 days, letting the top layer of soil dry out between waterings, and give it partial shade to full sun. It prefers temperatures of 50–75°F (10–24°C) and 40–60% humidity. Fertilize it every 6 months during the growing season.
Where Is the Giant fennel Native To?
What Is the Giant fennel?
Giant fennel (Schoenoselinum foeniculoides) belongs to the Apiaceae family within the Schoenoselinum genus. Giant fennel is native to Morocco, Western Sahara, and northern Mauritania. Giant fennel is also known as Mountain hemlock parsley.
Giant fennel displays a clumping herbaceous perennial growth habit, reaching up to 1.5 ft tall with a spread of approximately 1 ft. Giant fennel produces small white umbels.
Leaf size: approximately 4 inches.
How Often Should You Water a Giant fennel?
Schoenoselinum foeniculoides requires watering every 7–10 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 7–10 days
Let soil partially dry between waterings
What Light Does the Giant fennel Need?
Giant fennel thrives in partial shade to full sun.
Light Requirement
Partial shade to full sun
What Temperature and Humidity Does the Giant fennel Prefer?
Schoenoselinum foeniculoides grows best at temperatures of 50–75°F. Giant fennel prefers humidity levels of 40–60%.
Temperature
50–75°F
Humidity
40–60%
What Soil Mix Works Best for a Giant fennel?
Well-draining loamy soil with added compost for nutrients. Good drainage is essential for Giant fennel to prevent waterlogging, which leads to root rot and fungal issues.
How Often Should You Fertilize a Giant fennel?
Feed Giant fennel 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 Giant fennel?
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 Giant fennel?
Giant fennel can be propagated through seeds, division of root clumps.
Is the Giant fennel Toxic to Pets and Children?
Pet safety not verified
The ASPCA does not list Giant fennel, 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 Giant fennel?
Giant fennel is susceptible to aphids, spider mites, caterpillars. 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 Giant fennel Need?
Giant fennel grows outdoors in USDA Zone 10a – 11b. It survives winters down to planting zone 10a. Giant fennel is native to Morocco, Western Sahara, and northern Mauritania. In cooler regions, grow Giant fennel as a houseplant or bring it indoors before the first frost.
Hardiness Zone
Zone 10a – 11b
Keep exploring plants
Giant fennel 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 Schoenoselinum genus — compare its care with other Schoenoselinum species on PlantoScan.
Schoenoselinum is part of the Apiaceae plant family — browse all Apiaceae genera and species.
Giant fennel 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: Schoenoselinum foeniculoides (Maire & Wilczek) Jim.Mejías & P.Vargas, family Apiaceae (first published in Phytotaxa 212: 76 (2015)) — World Flora Online record, IPNI name record.
- Pet toxicity: Pet safety not verified: the ASPCA does not list Giant fennel, 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 10a – 11b, 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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