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  Ferocactus johnstonianus CACTUS ART
NURSERY

Cultivation and Mail Sale
of Cacti and Succulents.


Ferocactus johnstonianus is a rare, slow growing, extremely beautiful
and therefore particularly culture-worthy plant.
 

Description: Densely spined ,usually solitary, barrel cactus.
Stem: Spherical to short-cylindric
al.  With adulthood the plant can reach 60-100 cm in height (but usually less) and about 30-35 cm in diameter.
Ribs: 24-35
, up to 2 cm high, margins slightly tuberculate and undulate .
Areoles: Elliptical, 2 cm long and 7 mm wide rather closely set.
 With small conical glands.
Spines: Very numerous (
about 22 to 25), 5-7 cm long, and fine (1,2 mm thick) initially golden-yellow (or sometimes reddish on the newest growth), becoming brownish as they age.   Radials and centrals are very much alike, none hooked (or vaguely hooked in juvenile specimens), annulate, slightly spreading and more or less outwardly recurved. They are interlaced and cover the body nearly completely.
Flowers: 5cm long and 3,5 cm broad, tepals narrow, yellowish, or the outer ones reddish, short-accuminate, the margins slightly erose. Filaments yellowish below and gradually reddening toward the tip.
Stigma flesh colored, with 8-13 lobes. Scales on the tube orbicular.
Fruit: 2,5-3 cm long and 1.5 cm broad or 5-6 cm long including the flowers remnants, opening by a large pore at the base.
Seed: About 2 mm, black, shining, angled, pitted, wit
h a small white depressed hylum.

This species might be a population of Ferocactus cylindraceous, but it may also be a genetic link between F. cylindraceus and F. wislizeni.
 

Cultivation:  Plants are slow growing to start, but are easy to grow and require little care once they have reached a nice flowering size.  They are suited for a well-drained soil in full sun throughout the year. Pot culture: it grows best in a fairly roomy, well-drained container filled with a porous cactus soil mixture that doesn't contain too much humus. To insure robust plants, water and fertilize during the aestival growth cycle; this plant need plenty of water.  But it's necessary to avoid wetting the bodies of these plants while they are in sunlight. A wet cactus in the sun light can cause sun burning, which can lead to scars or even fungal infections and death.  In winter keep completely dry at 10C.  This usually aids in maintaining a healthier plant, but it can tolerate sporadic light frost.

Propagation:
Seeds are the only way of reproducing. Unfortunately seed material is very rarely available, and the seedlings are somewhat root-rot prone.
Frequently grafted on stronger and durable Ferocactus stock (i.e  F. glaucescens and F. pottsii)


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Family: Cactaceae (Cactus Family)
 

Scientific name:  Ferocactus johnstonianus  Britton & Rose
In: Cact. 4:287.1923

OriginIt is an island endemic from Angel de la Guardia Island, Baja California,  Mexico.

Conservation status: Listed in CITES appendix 2.

Common Names include: Johnston's Barrel Cactus  

Synonyms:  
  • Ferocactus acanthodes var. johnstonianus  (Britton & Rose) Unger comb. et stat.nov.
  • Echinocactus johnstonianus  Fosberg 1942
  • Ferocactus cylindraceus var. johnstonianus  Starling 1988
  • Ferocactus peninsulae var. johnstonianus  Starling 1988
 



This Ferocactus is surely one of most beautiful, sought after and highly prized by impassioned collectors, but it is seldom found in a collection.

Photo of conspecific taxa, varieties, forms and cultivars of Ferocactus cylindraceus:

Photo gallery: Alphabetical listing of Cactus and Succulent pictures published in this site.

Photo gallery Ferocactus

Home | E-mail | Plant files | Mail Sale Catalogue | Links | Information | Search

All the information and photos in cactus art file are now available also in the new the Enciclopedia of Cacti. We hope you find this new site informative and useful.