WorldFloraDB - Heracleum mantegazzianum

Characteristics

Erect biennial. Stems hispid, hollow, grooved, reddish purple blotched and spotted, particularly toward base, up to 350 cm high and 10 cm diam. Basal lvs moderately hispidulous below, sparsely above, pinnately 3-foliolate, petiolate; leaflets ovate to ovate-lanceolate, deeply ternately or pinnately lobed and irregularly double serrate, up to 50-(100) cm long; lobes usually acute to acuminate; stem lvs similar to basal, with petiole often reduced to sheathing part only; petioles reddish purple blotched and spotted. Umbels (20)-30-60 cm diam.; rays (20)-50-70-(100), the primary umbels > 50-rayed; bracts usually c. 12, linear, 10-15 mm long; bracteoles 8-12, linear, up to 15 mm long. Fls numerous, white; outer fls irregular and up to 15 mm diam. Fr. glabrous, ovate-elliptic, light brown, c. 10 mm long; vittae conspicuous, 0.5-1 mm wide at base.

More

Very robust biennial or monocarpic perennial 2–5 m, stem usually purple-blotched; lvs to 3 m, ternate or ternate-pinnate, with pinnately lobed lateral segments to 13 dm; umbels to 5 dm wide, with 50–150 rays; pet ca 1 cm; fr 8–11 mm, on pedicels 1.5–4 cm; 2n=22. Native of sw. Asia, recently established as a weed in c. and w. N.Y., and to be expected to spread.

A herb.

Life form

perennial

Growth form

herb

Growth support

-

Foliage retention

deciduous

Sexuality

hermaphrodite

Pollination

entomogamy

Spread

anemochory

Mature width (meter)

-

Mature height (meter)

1.88 - 3.5

Root system

tap-root

Rooting depth (meter)

-

Root diameter (meter)

-

Flower color

Blooming months

Jan	Feb	Mar
Apr	May	Jun
Jul	Aug	Sep
Oct	Nov	Dec

Fruit color

-

Fruiting months

-

Nitrogen fixer

-

Photosynthetic pathway

c3

Environment

It is a temperate plant.

Light
Soil humidity
Soil texture
Soil acidity
Soil nutriment
Hardiness (USDA)

Usage

Uses	bee plant environmental use invasive weed medicinal ornamental poison silage weed
Edible	leaves
Therapeutic use	-
Human toxicity	strong toxic (whole)
Animal toxicity	toxic (whole)

Cultivation

Mode	-
Germination duration (days)	19 - 52
Germination temperacture (C°)	19 - 21
Germination luminosity	-
Germination treatment	-
Minimum temperature (C°)	-45
Optimum temperature (C°)	-
Size	-
Vigor	-
Productivity	-