© Hans-Simon Holtzbecker · Public domain · Commons
Tulipa gesneriana
Toxic🐾Garten-Tulpe · (Tulipa gesneriana)
Lily family (Liliaceae)
Description
During the Dutch Hunger Winter of 1944/45, authorities in The Hague and Amsterdam issued public instructions for turning this lily-family plant's bulbs into emergency food, after removing the central sprout and boiling them repeatedly – yet despite careful preparation, numerous cases of nausea and diarrhoea are documented. Today that use is purely historical, since every part of the plant contains tuliposides A and B, which break down into skin-irritating tulipalin A when crushed. This mechanism is best known as the occupational condition „tulip fingers“: florists and bulb packers with prolonged skin contact to the bulb sap develop painful, cracked contact dermatitis on fingertips and nail folds. Sporadic historical notes from Anatolia and the Persian-Ottoman world describe cooling flower poultices for skin irritation – a vague reference with no modern relevance. Because tulip bulbs are repeatedly mistaken for edible onions, and even small amounts can trigger severe gastrointestinal symptoms in children, they should be stored strictly out of reach of children and pets – culinary or medicinal use cannot be recommended.
🌿 Risk of confusion — read before wild-harvesting!
Confusion with edible onions has been described repeatedly.
External use only!
This plant must NOT be taken internally. Use only as compress, salve, or bath.
CONTRAINDICATED during pregnancy
No pharmacological application. Consumption of bulb or flower in pregnancy contraindicated due to gastroenteritis risk (electrolyte loss, dehydration, theoretical fetal impact via maternal hypovolaemia).
CONTRAINDICATED during breastfeeding
No pharmacological application. Tulipalin metabolites may theoretically pass into breast milk — data are entirely lacking. Consumption while breastfeeding is contraindicated.
CONTRAINDICATED for children
Children are particularly at risk because colourful tulip bulbs (stored in autumn) can easily be confused with edible onions and petals can be swallowed accidentally. Even small amounts can trigger severe gastrointestinal symptoms. Strictly store tulip bulbs out of reach of children.
Classic dermatologically documented occupational risk 'tulip fingers' (Dutch 'tulpenvingers'): florists, bulb packers and horticultural workers with prolonged skin contact to tuliposide A during sorting and packing of tulip bulbs develop allergic contact dermatitis on fingertips, nail folds and palms. Clinical picture: dry, painful, fissured skin with scaling, sometimes paronychia and subungual hyperkeratosis. Mechanism: tuliposide A converts enzymatically to tulipalin A, an alpha-methylene-gamma-butyrolactone acting as a strong contact allergen. A standard patch-test allergen in occupational dermatology.
Preparation & dosage
Sporadically documented folk-medicinal use in rural regions of Anatolia (origin region of the garden tulip): crushed tulip flowers were locally applied to minor burns, insect stings and small skin irritations — a cooling, mechanical effect. No pharmacologically proven healing action. Because flowers also contain tuliposides, contact dermatitis is possible in sensitised individuals.
Preparation & dosage
In the Persian and Ottoman cultural sphere (16th-18th century) the tulip was primarily an ornamental and symbolic plant ('lale'); single herbals of that period mention an external use of the flowers as cooling poultice for skin irritations and small cuts. The documentation is vague and the use is regarded as purely historical today.
Preparation & dosage
Phytochemically documented antifungal property of tulipalin A and tulipalin B from tulip bulbs (especially against Botrytis cinerea, Fusarium spp. and some yeasts): the compounds act as part of the plant's chemical defence system against fungal infections of the bulb. There is no medical application in humans — data come from plant-pathology and agrochemical studies. Listed as a phytochemically interesting observation, not a therapeutic indication.
Preparation & dosage
Historical documentation only — do NOT use
These internal applications are historically documented. This plant is highly toxic — self-treatment can cause severe poisoning or death. For documentation only, explicitly NOT a recommendation.
Ethnobotanically documented emergency-food use of tulip bulbs during the Dutch Hunger Winter 1944/45 ('Hongerwinter'): after regular food supply collapsed in the occupied western Netherlands, authorities in The Hague and Amsterdam issued public instructions for eating tulip bulbs. The bulbs were peeled, the central sprout removed (it contains the highest tuliposide/tulipalin concentrations) and then boiled, roasted or ground as flour substitute. Flavour: bitter to soapy. Despite preparation, numerous gastroenteritis cases are documented. Today strictly historical — not a recommendation, as tulipalin A remains in residual amounts after any preparation.
Preparation & dosage
Petals of the garden tulip were occasionally used during the Dutch Hunger Winter 1944/45 too, but are less well documented than the bulbs. Today sometimes recommended in hobby-cook circles as an edible flower for decoration — not advisable because of tulipalin content, sensitised people can develop oral mucosal irritation.
Preparation & dosage
⚠ External use only
TOXIC — especially the bulb. All parts of Tulipa gesneriana contain tuliposide A and B as well as their aglycones tulipalin A and B (alpha-methylene-gamma-butyrolactones), most concentrated in the bulb and central sprout. Skin contact with bulb sap causes 'tulip fingers' — a classically described occupational allergic contact dermatitis in florists, bulb packers and horticultural workers. Consuming the bulb causes oral burning, nausea, vomiting, cramping abdominal pain and diarrhoea (gastroenteritis); the Dutch Hunger Winter 1944/45 documented emergency-food poisonings. Confusion with edible onions has been described repeatedly. Also toxic to dogs, cats and horses (symptoms: hypersalivation, vomiting, diarrhoea, in severe form tachycardia and respiratory distress). On suspected poisoning: call poison control, do not induce vomiting, offer plenty of fluids. ASPCA classification (accessed 2026-08-10): toxic to dogs and cats. The ASPCA classifies the whole genus this way.
No pharmacological application. Consumption of bulb or flower in pregnancy contraindicated due to gastroenteritis risk (electrolyte loss, dehydration, theoretical fetal impact via maternal hypovolaemia).
No pharmacological application. Tulipalin metabolites may theoretically pass into breast milk — data are entirely lacking. Consumption while breastfeeding is contraindicated.
Children are particularly at risk because colourful tulip bulbs (stored in autumn) can easily be confused with edible onions and petals can be swallowed accidentally. Even small amounts can trigger severe gastrointestinal symptoms. Strictly store tulip bulbs out of reach of children.
Drug interactions
Topische Kortikosteroide (Hydrocortison, Mometason)
In occupational tulip-finger dermatitis topical steroids are used therapeutically — no interaction in the classical pharmacological sense, but the skin barrier is impaired and other allergens may be absorbed more strongly under steroid ointment. Strict allergen avoidance is mandatory during treatment.
Contraindications
- Known tulip or Liliaceae allergy (cross-reaction with Alstroemeria, hyacinth, narcissus possible)
- Occupational sensitisation to tuliposide/tulipalin (florists, bulb packers, horticultural workers with documented history of 'tulip fingers')
- Chronic inflammatory bowel disease (irritation of already damaged mucosa by tulipalin)
- Pregnancy and breastfeeding (see above)
- Children under 12 — no consumption, no toy handling with cut bulbs
Harvested part: bulb
- Time of day:
- After foliage has died back, on a dry day — the bulb then has maximal nutrient storage and best shelf-life.
- Drying:
- Remove adhering soil with a soft brush, DO NOT wash. Cure bulbs for 1-2 weeks in flat wooden crates or nets in a shady, dry, well-ventilated place. When handling, wear PROTECTIVE GLOVES (nitrile/PVC) — skin contact with bulb sap triggers the typical tulip-finger reactions.
- Storage:
- 4 months — Dry, dark, cool (15-20 °C in summer, from October at 5-9 °C for cold period needed for flower induction); out of reach of children and pets. Clearly label as 'tulip bulb — not for consumption' to prevent confusion with edible onions.
- Time of day:
- Early morning in dry weather, shortly after the flowers have opened — for cut flowers or purely decorative/ethnobotanical documentation. No medical indication.
- Drying:
- Petals can be press-dried (herbarium); for drying with preserved anthocyanin colour, dry quickly at 30-35 °C in the dark. Wear gloves even when handling cut flowers, as flower and stem also contain tuliposides.
- Tuliposide AGlycosideContent: bis 1.5 % in der Zwiebel (zentraler Spross am höchsten)use.plant_part.bulb
Main glycoside of tulip; glucose ester of 4-hydroxy-2-methylene-butanoic acid. Water-soluble, non-toxic when intact, but on crushing or contact with plant enzymes rapidly converted to the highly reactive aglycone tulipalin A — the cause of tulip-finger dermatitis. Highest concentration in young sprout tissue and inner bulb scales.
- Tuliposide BGlycosideContent: 0.1-0.4 % in der Zwiebeluse.plant_part.bulb
Accompanying glycoside with an additional hydroxyl group on the lactone precursor. Cleaves to tulipalin B, whose contact-allergenic effect is somewhat weaker than tulipalin A. Still patch-positive in sensitised florists.
- Tulipalin A (alpha-Methylen-gamma-Butyrolacton)OtherContent: entsteht in vivo aus Tuliposid Ause.plant_part.bulb
Aglycone of tuliposide A; reactive alpha-methylene-gamma-butyrolactone with Michael-acceptor function. Reacts covalently with nucleophilic amino-acid side chains (cysteine-SH, lysine-NH2) in skin proteins, forming hapten-protein conjugates — molecular basis of type IV sensitisation. Also antifungal against Botrytis cinerea, Fusarium and some yeasts.
- Tulipalin BOtherContent: entsteht in vivo aus Tuliposid Buse.plant_part.bulb
Hydroxylated aglycone of tuliposide B; analogous Michael-acceptor reactivity to tulipalin A but lower concentration and allergenicity. Contributes to overall reactivity of tulip bulb sap.
- TulipaninFlavonoidContent: in der Blüte, je nach Sorte unterschiedlichFlower
Anthocyanin glycoside (delphinidin-3-rutinoside) — responsible for the deep violet to black-purple of classical tulip cultivars. Pharmacologically without therapeutic relevance; important for plant pigment chemistry and historically for tulipomania 1637 (striped varieties were caused by tulip mosaic virus, which broke up pigment distribution).
- Polysaccharide (Glucomannane, Stärke)PolysaccharideContent: Hauptbestandteil des Zwiebelgewebes (Trockensubstanz dominiert)use.plant_part.bulb
Storage carbohydrates of the bulb; from a plant-physiological perspective the substantial mass of the underground organ. This calorie source explains why tulip bulbs were considered emergency food at all during Hunger Winter 1944/45 — without the accompanying tuliposides they would be an acceptable starch food.
- Oxalsäure und Oxalat-KristalleOtherContent: Spuren bis geringe Mengenuse.plant_part.bulb
Detected in tulip bulbs in small amounts; contribute to mucosal irritation on ingestion but are not the main cause of gastroenteritis (that is tulipalin A). Calcium oxalate raphides can mechanically contribute to oral and pharyngeal irritation.
- Flavonoide (Kämpferol- und Quercetin-Glykoside)FlavonoidContent: nicht quantifiziertFlower
Companion flower flavonoids alongside the anthocyanin tulipanin; contribute to yellow pigmentation of some cultivars (co-pigmentation). Antioxidant capacity demonstrable in vitro, without therapeutic relevance.
- [8]MonographASPCA Animal Poison Control — Tulip (Tulipa spp.)(accessed: 2026-08-10)
- [9]MonographCliniTox Giftpflanzen — Tulipa gesneriana L.: giftig + (Institut für Veterinärpharmakologie und -toxikologie, Universität Zürich)(accessed: 2026-08-10)
- [5]BookPlants for a Future — Tulipa gesneriana(accessed: 2026-05-27)
- [1]WikipediaGarten-Tulpe — Wikipedia (DE)(accessed: 2026-05-27)
- [2]WikipediaTulipa gesneriana — Wikipedia (EN)(accessed: 2026-05-27)
- [3]WikipediaTulipalin A — Wikipedia (EN)(accessed: 2026-05-27)
- [4]WikipediaDutch famine of 1944-45 (Hongerwinter) — Wikipedia (EN)(accessed: 2026-05-27)
- [6]WikipediaTulip finger / Tulpenfinger — Allergische Kontaktdermatitis (Wikipedia DE)(accessed: 2026-05-27)
- [7]WikipediaTulipa — Wikipedia (EN)(accessed: 2026-05-27)