Photo: Melissa McMasters from Memphis, TN, United StatesCC BY 2.0via Wikimedia Commonsresized / cropped
Tall Blue Lettuce Plant Care
Lactuca biennis (Moench) Fernald
Updated · Sources · How we source care data
Lactuca biennis is a North American species of wild lettuce known by the common names tall blue lettuce and blue wood lettuce. It is widespread across much of the United States and Canada from Alaska and Yukon south as far as California, New Mexico, and Georgia.
Full sun to partial shade
At a glance
How do you care for Tall Blue Lettuce?
Tall Blue Lettuce grows best in full sun to partial shade.
What Is the Tall Blue Lettuce?
Tall Blue Lettuce (Lactuca biennis) belongs to the Asteraceae family within the Lactuca genus. Tall Blue Lettuce is also known as Biennial Lettuce, Agathyrsus floridanus, Cicerbita spicata.
Tall Blue Lettuce displays a compact rosette growth habit, reaching up to tall with a spread of approximately . Tall Blue Lettuce produces small yellow flowers in clusters.
What Light Does the Tall Blue Lettuce Need?
Tall Blue Lettuce thrives in full sun to partial shade.
Light Requirement
Full sun to partial shade
What Soil Mix Works Best for a Tall Blue Lettuce?
Well-draining, fertile loam with added compost. Good drainage is essential for Tall Blue Lettuce to prevent waterlogging, which leads to root rot and fungal issues.
How Do You Repot a Tall Blue Lettuce?
Repot every 1-2 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 Tall Blue Lettuce?
Tall Blue Lettuce can be propagated through seeds. Similar propagation techniques also apply to alpine lettuce plant care, which shares the same genus.
Is the Tall Blue Lettuce Toxic to Pets and Children?
Pet safety not verified
The ASPCA does not list Tall Blue Lettuce, 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 Tall Blue Lettuce?
Tall Blue Lettuce is susceptible to aphids, slugs, snails. 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.
Keep exploring plants
Tall Blue Lettuce 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 Lactuca genus — compare its care with other Lactuca species on PlantoScan.
Lactuca is part of the Asteraceae plant family — browse all Asteraceae genera and species.
Tall Blue Lettuce thrives in bright light and direct sun — see other bright-light plants.
More Lactuca Species
Other Lactuca species in PlantoScan's care catalogue share similar watering, light, and soil preferences:
Sources
- Scientific name & taxonomy: Lactuca biennis (Moench) Fernald, family Asteraceae (first published in Rhodora 42: 300 (1940)) — World Flora Online record, IPNI name record.
- Pet toxicity: Pet safety not verified: the ASPCA does not list Tall Blue Lettuce, 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: Melissa McMasters from Memphis, TN, United States, CC BY 2.0, Wikimedia Commons — original.
- 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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