Tall Blue Lettuce (Lactuca biennis)

Botanical names:
Lactuca biennis Accepted
Sonchus spicatus Synonym

General Plant Information (Edit)
Plant Habit: Herb/Forb
Life cycle: Biennial
Sun Requirements: Full Sun to Partial Shade
Water Preferences: Wet Mesic
Mesic
Soil pH Preferences: Slightly acid (6.1 – 6.5)
Neutral (6.6 – 7.3)
Slightly alkaline (7.4 – 7.8)
Plant Height: 2 to 8 feet or more
Leaves: Other: Variable in size, lower leaves up to 12 inches long, upper leaves smaller
Fruit: Other: Small seed heads containing flat, brown seeds
Flowers: Showy
Flower Color: Blue
Other: Pale blue to whitish
Bloom Size: Under 1"
Flower Time: Late summer or early fall
Fall
Underground structures: Taproot
Toxicity: Other: Leaves and stems and roots contain a milky sap that may cause contact dermatitis in some individuals

Image

Discussion Threads about this plant
Thread Title Last Reply Replies
Any ideas? by threegardeners Jul 5, 2013 2:47 AM 27

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