Acanthus mollis
L.
Bear's breeches, Sea dock, Sea holly, Gator plant
A perennial herbaceous plant, 1-1.5 m high, erect, stout and vigorous,
attached to the ground by long, very sticky, reddish, tuberous roots.
Its large, shiny, dark green leaves, up to more than 1 m long, are
tightly grouped around the base of the stem, forming an elegant basal
rosette.
They are simple, alternate, long stalked, smooth, and with
their leaf lamina divided into 6-7 large, deep, irregular and sharply
toothed lobes, the terminal lobe being larger than the others.

The pinkish-whitish flowers are arranged in elegant and showy
cylindrical spikes up to 60 cm high. The calyx is bilabiate, with a more
oblong upper lip, arched over the corolla, and greenish or violet in
colour.
Its corolla is formed by a single tube-shaped piece about 3-5
cm long, which extends in its lower section forming a long lip, finally
divided into three rounded lobes, generally tinged with purple; on this
lip rest four thick stamens, somewhat twisted and with hairy anthers.
Each flower is surrounded by a few reddish-green, oval bracts with spiny
teeth.
The fruits consist of stout oval capsules about 2-3 cm long,
each containing two to four smooth seeds, about 10-12 mm long and black
in colour.
The specimens dry up in summer, and are reborn with the
arrival of the first autumn rains.
The whole plant gives off a rather
unpleasant smell.
Flowering occurs from late winter to early summer.
It multiplies by
seed and by cuttings from its underground stems, sown in early spring.
When the fruits are ripe, the seeds jump out of the spike and readily
set in the ground around the bush.
This species is native to the
central and eastern Mediterranean region, where it has been used as an
ornamental and medicinal plant since ancient times.
It has been
spreading and naturalising in many parts of the world: United States,
Ireland, Malta, Serbia, Montenegro, Turkey, Syria, etc.