# bitter lettuce (*Lactuca virosa*)

Bitter lettuce is a leafy plant that grows in gardens and fields. Its leaves are green and can be a bit sharp in taste, which is why it’s called 'bitter'!

- **Category:** [Plants](https://www.snappit.app/explore/categories/plant)
- **Rarity:** Common
- **Danger:** 2/5 · Low
- **Habitat:** Grasslands

![bitter lettuce](https://commons.wikimedia.org/w/index.php?title=Special:Redirect/file/Lactuca_virosa_-_K%C3%B6hler%E2%80%93s_Medizinal-Pflanzen-213.jpg&width=800)

Photo: Franz Eugen Köhler, Köhler's Medizinal-Pflanzen, Public domain · [Wikimedia Commons](https://commons.wikimedia.org/wiki/File:Lactuca_virosa_-_K%C3%B6hler%E2%80%93s_Medizinal-Pflanzen-213.jpg)

## Appearance

The bitter lettuce is a tall, upright plant with a robust, often reddish-purple stem. It features deeply lobed, spiny-edged green leaves that clasp the stem, topped with clusters of small, pale yellow dandelion-like flowers.

## Taxonomy

- **Kingdom:** Plantae
- **Phylum:** Tracheophyta
- **Class:** Magnoliopsida
- **Order:** Asterales
- **Family:** Asteraceae
- **Genus:** Lactuca

## Interesting facts

- Ancient Romans sometimes used its milky sap to help them relax and sleep!
- Its super bitter taste comes from special chemicals that tell animals "Don't eat me!"
- It’s nicknamed "opium lettuce" because its sap can look like a mild version of opium.
- The seeds are carried far and wide by tiny parachutes, just like dandelion seeds!

## Special abilities

- **Spiky Shield:** Bitter lettuce has spiny leaves and stem bristles that deter hungry herbivores from taking a bite.
- **Calming Milk:** The plant produces a milky sap, known as lactucarium, which can have calming effects and deters pests.
- **Deep Drinker:** Its long taproot allows bitter lettuce to reach deep into the soil for water and nutrients, especially in dry areas.

## Measurements & details

- **Height:** 60-200 cm
- **Flower Size:** 1-2 cm
- **Bloom Season:** Summer-fall
- **Edible:** No
- **Toxicity:** Mild
- **Lifecycle:** Biennial
- **Pollination Method:** Insect

## Ecological connections

- **Pollinates:** European honey bee (*Apis mellifera*) — Visits flowers for nectar and pollen.
- **Pollinates:** buff-tailed bumblebee (*Bombus terrestris*) — Forages on its small yellow flower heads.
- **Pollinates:** [common drone fly](https://www.snappit.app/explore/common-drone-fly) (*Syrphus ribesii*) — Adult flies visit its flowers for nectar.

## Traits

- [Flowering](https://www.snappit.app/explore/traits/flowering): Flowering plants are any plants that produce flowers as part of their reproductive cycle.
- [Biennial](https://www.snappit.app/explore/traits/biennial): Biennial plants complete their life cycle over two growing seasons, typically forming foliage in the first year and flowering/seeding in the second.
- [Summer Blooming](https://www.snappit.app/explore/traits/summer-blooming): Summer blooming plants produce their flowers during the summer season, often providing vibrant color when many other plants have finished.
- [Fragrant Flower](https://www.snappit.app/explore/traits/fragrant-flower): Fragrant flowers emit a pleasant aroma, often to attract pollinators or for defense.
- [Agricultural](https://www.snappit.app/explore/traits/agricultural): This human use trait describes species cultivated or domesticated by humans for agricultural purposes, including crops and livestock.
- [Edible](https://www.snappit.app/explore/traits/edible): Edible plants are those parts of a plant that are considered safe for human consumption.
- [Grassland](https://www.snappit.app/explore/traits/grassland): Grassland habitats are terrestrial biomes dominated by grasses and herbaceous plants, supporting a variety of grazing animals.
- [Pollinator Magnet](https://www.snappit.app/explore/traits/pollinator-magnet): Describes plants that are particularly attractive and beneficial to a wide range of pollinating organisms.

## Collections

- [Plants](https://www.snappit.app/explore/collections/plants)

## Safety

**Danger:** 2/5 · Low

Do not eat any plants unless an adult says it's safe!

## Frequently Asked Questions

### How to identify bitter lettuce?

Start with the whole plant, then compare leaf arrangement, leaf edges, stems and any flowers or fruit. Opposite leaves grow in pairs; alternate leaves come one at a time along the stem. These details tell you far more together than a single green leaf does. Plant Identifier: upload a photo and compare the visible details.

### How tall is bitter lettuce?

60-200 cm

### How big are the flowers on bitter lettuce?

1-2 cm

### When does bitter lettuce bloom?

Summer-fall

### Is bitter lettuce edible?

No

### Is bitter lettuce toxic?

Mild

### What is bitter lettuce's lifecycle?

Biennial

### How is bitter lettuce pollinated?

Insect

## More Plants

- [white snakeroot](https://www.snappit.app/explore/white-snakeroot) (*Ageratina altissima*)
- [tree-of-heaven](https://www.snappit.app/explore/tree-of-heaven) (*Ailanthus altissima*)
- [western sword fern](https://www.snappit.app/explore/western-sword-fern) (*Polystichum munitum*)
- [common milkweed](https://www.snappit.app/explore/common-milkweed) (*Asclepias syriaca*)

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Source: [Bitter Lettuce: Facts & Places to See — Snappit](https://www.snappit.app/explore/bitter-lettuce)