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Il fiore tra le spine

Tag: habitat

Secondo uno studio di “Nature Plants” i cactus sono le piante più esposte a rischio estinzione

“Cactaceae (cactus), una famiglia di piante del Nuovo Mondo, è uno dei gruppi di organismi più a rischio di estinzione del pianeta“. L’assunto è tranchant ma la fonte, purtroppo, è attendibile, dal momento che il passaggio è tratto da un estratto di uno studio pubblicato da Nature Plants, rivista scientifica pubblicata da Nature Publishing Group. Lo studio è stato pubblicato nell’aprile del 2022 con il titolo “Elevato rischio di estinzione dei cactus a causa dei cambiamenti climatici”. Può sembrare un paradosso, dal momento che alcune cactacee stanno adattandosi a climi non propriamente ideali, come quelli che caratterizzano le Alpi Svizzere, come ho riportato in un precedente articolo. Purtroppo è tutto connesso, collegato e conseguente al cambiamento climatico.

Vediamo in dettaglio cosa riporta lo studio pubblicato da Nature Plants (…).

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Strane combinazioni della Natura: come ci è finito un onzuka nel vaso di un vecchio Thelocactus?

Quando si coltivano molte piante in uno spazio relativamente ristretto come può essere quello offerto da una serra (per quanto capiente), può capitare spesso di scoprire gradite soprese nei vasi. I cactus i cui fiori sono stati impollinati naturalmente dagli insetti o i cactus autofertili, in grado di fare tutto da soli, producono frutti, che una volta secchi si spaccano lasciando cadere i semi direttamente sul terriccio alla base della pianta. E’ così che ci si può trovare con esemplari di una certa età contornati da semenzali o piantine di piccole dimensioni, in una sorta di riproposizione “in vaso” di ciò che avviene comunemente in natura. A dispetto di quello che si potrebbe pensare osservando le precise procedure necessarie per la riproduzione dei cactus, la semina spontanea è un fenomeno comune nelle cactacee e talvolta è in grado di regalare vere e proprie sorprese, come è capitato a me in questi giorni.

Ecco, nell’articolo che segue, un piccolo resoconto. (…)

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Operazione Atacama: un bell’esempio di lotta contro il traffico illecito di cactus

E’ stata battezzata “Operazione Atacama” ed è di fatto la più vasta operazione di polizia nella storia italiana del contrasto al traffico illecito di piante grasse. Conclusa nelle scorse settimane, l’operazione portata avanti dai Carabinieri italiani in collaborazione con la Polizia cilena ha condotto al sequestro di un migliaio di cactus rari (quasi tutti appartenenti ai generi Copiapoa ed Eriosyce), buona parte dei quali sono poi stati rispediti in Cile per tentare il reintegro nel loro habitat naturale.

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Direttamente dal parco di Anza-Borrego in California, le foto in habitat dei Ferocactus

Il genere Ferocactus è tra i più apprezzati e coltivati dagli appassionati di cactus. E’ la cactacea spinosa per eccellenza, dotata di forti e lunghe spine, spesso uncinate, e con l’età può raggiungere dimensioni notevoli anche se coltivata in vaso. Vediamo, in questa stupenda gallery di foto scattate da Ben Grillo, come queste piante crescono nel loro habitat naturale.

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Echinocactus polycephalus: una straordinaria serie di foto per capire come cresce in natura

Osservare cactus e succulente in natura è utilissimo. Ci permette di conoscere meglio le piante che coltiviamo e ci consente di capire in che condizioni vivono nel loro habitat, così che possiamo poi cercare, nei limiti del possibile, di creare condizioni ottimali per la loro corretta crescita.

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