{"id":848,"date":"2025-10-18T09:37:12","date_gmt":"2025-10-18T14:37:12","guid":{"rendered":"http:\/\/opuntiads.com\/oblog\/?p=848"},"modified":"2025-10-18T09:37:12","modified_gmt":"2025-10-18T14:37:12","slug":"echinocactus-polycephalus","status":"publish","type":"post","link":"https:\/\/opuntiads.com\/oblog\/echinocactus-polycephalus\/","title":{"rendered":"Echinocactus polycephalus"},"content":{"rendered":"

(Photograph: Echinocactus polycephalus xeranthemoides, Nancy Hussey)<\/sup><\/p>\n

Introduction<\/h2>\n

Echinocactus polycephalus is a many-headed barrel cactus of the Mojave Desert. Plants are usually solitary when young and form dense clusters with age. Heavy ribs and stout spines give each head a bristly look, and the overall clump can be striking on rocky slopes and desert flats.<\/p>\n

The Details<\/h3>\n

Habit and size<\/h4>\n

Young plants are spherical to short-cylindrical. Over time, new heads arise at the base, creating low mounds. In exposed sites, stems stay compact and heavily armed; in slightly sheltered microsites, they may grow a bit taller.<\/p>\n

Spines and surface<\/h4>\n

Spines are stout and closely set, often obscuring the stem. Ribs are deep, allowing the plant to swell after rains and contract during drought. This shape helps the cactus store water while limiting surface exposure.<\/p>\n

Range and habitat<\/h4>\n

Echinocactus polycephalus occurs in the Mojave Desert on rocky slopes, alluvial fans, and gravelly flats with excellent drainage. Plants handle intense sun, wide temperature swings, and long dry spells typical of this region.<\/p>\n

Flowers and fruit<\/h4>\n

In favorable seasons, mature heads produce spring to early-summer flowers at the crown, followed by dry fruits that hold many seeds. Bloom varies with rainfall and temperature; in very dry years, flowering may be sparse.<\/p>\n

Cultivation notes<\/h4>\n

This species is slow and best for experienced growers. Use a very coarse, fast-draining mix, strong light, and careful watering\u2014soak thoroughly during warm growth, then let the mix dry before watering again. Keep cool and almost dry in winter to prevent rot.<\/p>\n

Additional Reading: Splitting Echinocactus<\/a><\/p>\n

\"Echinocactus <\/a>
Echinocactus polycephalus polycephalus, juvenile plant, north of Las Vegas, NV <\/div> <\/div>
\"Echinocactus <\/a>
Echinocactus polycephalus xeranthemoides, near Meadview, AZ, Nancy Hussey <\/div> <\/div> <\/div>
\"Echinocactus <\/a>
Echinocactus polycephalus xeranthemoides, near Meadview, AZ, Nancy Hussey <\/div> <\/div> <\/div> <\/div>
\"Echinocactus <\/a>
Echinocactus polycephalus xeranthemoides, near Meadview, AZ, Nancy Hussey <\/div> <\/div> <\/div>
\"Echinocactus <\/a>
Echinocactus polycephalus polycephalus, juvenile plant north of Las Vegas, NV <\/div> <\/div>
\"Echinocactus <\/a>
Echinocactus polycephalus polycephalus, new north of Las Vegas, NV <\/div> <\/div> <\/div> <\/div> <\/div>\n","protected":false},"excerpt":{"rendered":"

(Photograph: Echinocactus polycephalus xeranthemoides, Nancy Hussey) Introduction Echinocactus polycephalus is a many-headed barrel cactus of the Mojave Desert. Plants are usually solitary when young and form dense clusters with age. Heavy ribs and stout spines give each head a bristly look, and the overall clump can be striking on rocky slopes and desert flats. The […]<\/p>\n","protected":false},"author":4,"featured_media":861,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[3],"tags":[31,47,33],"class_list":["post-848","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-cacti","tag-deserts","tag-spines","tag-the-west"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"https:\/\/opuntiads.com\/oblog\/wp-content\/uploads\/2014\/12\/echinocactus-polycephalus-xeranthermoides-nh.jpg","jetpack_sharing_enabled":true,"jetpack_likes_enabled":true,"_links":{"self":[{"href":"https:\/\/opuntiads.com\/oblog\/wp-json\/wp\/v2\/posts\/848","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/opuntiads.com\/oblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/opuntiads.com\/oblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/opuntiads.com\/oblog\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/opuntiads.com\/oblog\/wp-json\/wp\/v2\/comments?post=848"}],"version-history":[{"count":2,"href":"https:\/\/opuntiads.com\/oblog\/wp-json\/wp\/v2\/posts\/848\/revisions"}],"predecessor-version":[{"id":7003,"href":"https:\/\/opuntiads.com\/oblog\/wp-json\/wp\/v2\/posts\/848\/revisions\/7003"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/opuntiads.com\/oblog\/wp-json\/wp\/v2\/media\/861"}],"wp:attachment":[{"href":"https:\/\/opuntiads.com\/oblog\/wp-json\/wp\/v2\/media?parent=848"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/opuntiads.com\/oblog\/wp-json\/wp\/v2\/categories?post=848"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/opuntiads.com\/oblog\/wp-json\/wp\/v2\/tags?post=848"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}