Un buon terriccio per cactus con materiali facilmente reperibili in ogni vivaio? Ecco come fare

Navigando in Internet si può constatare come sia ormai facile trovare rivenditori di materiali per la coltivazione di piante. Questo vale anche nello specifico di cactus e piante succulente: online, dai vivaisti specializzati alle imprese che trattano unicamente materiali come terricci, vasi, etichette, ecc., è davvero semplice procurarsi tutto l’occorrente per la coltivazione. 

Ma se non vogliamo comprare online? Se abbiamo bisogno di grandi quantitativi di materiale e la spedizione può arrivare solo fino a un certo peso? Se preferiamo provvedere direttamente acquistando il terriccio (ognuno può avere i suoi motivi per questa o quella scelta)? Ci affidiamo ai terricci pronti solitamente proposti da qualsiasi vivaio o garden  ben fornito? O forse è meglio che provvediamo noi stessi, assemblando i vari materiali come torba, pomice, sabbia, sulla base delle nostre esigenze?

In questo articolo e nel video finale vediamo come realizzare un corretto substrato da utilizzare con qualsiasi genere di cactus e, con opportuni correttivi, con le succulente in generale. Lo realizzeremo – ed è questo il senso di questo articolo – con materiali che ormai chiunque può reperire facilmente in qualsiasi città (…).

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La torba è davvero un killer di cactus? Miti e conferme sui materiali di coltivazione

Ci metto il lapillo o solo la pomice? La torba è davvero un demonio ammazza-cactus, così come si sente dire in giro? Ma allora com’è che i vivaisti coltivano in torba quasi al 100% e non passano le giornate a contare i morti in serra? E’ un campo (e il termine ci sta tutto) sterminato, quello dei materiali e degli elementi che possono finire in una composta per cactus e piante grasse.

Un campo sterminato in primo luogo perché le variabili sono infinite e vanno dai regimi di coltivazione, ai fattori ambientali, alla latitudine, fino alla tipologia di pianta (ci sono differenze tra le esigenze, in termini di substrato, tra una caudiciforme e un cactus, per esempio). Poi perché gli stessi elementi, si pensi alla terra di campo, possono variare immensamente tra loro. Ad esempio in base alla zona di “prelievo”: chiaro che la terra della Pianura Padana non può avere le stesse caratteristiche chimiche di quella di una certa zona della Bolivia, per dirne una.

Sicché, come ci si orienta tra i tanti elementi e materiali che possiamo reperire – alcuni facilmente, altri meno – per poi miscelarli e realizzare una buona composta? Una prima risposta, banale finché vogliamo ma sempre sensata, è l’esperienza. L’osservazione diretta. La sperimentazione, insomma. Un’altra risposta banale e forse proprio per questo spesso lasciata cadere nel vuoto è la conoscenza. Conoscenza delle proprietà dei singoli “ingredienti” che vanno a creare il substrato e conoscenza delle esigenze della singola pianta.

Ecco allora, nell’articolo che segue, una panoramica di alcuni elementi che nel corso degli anni ho usato nelle mie miscele: alcune studiate, frutto di confronto con amici coltivatori o di letture di libri scritti da attendibili cactofili, altre incoscientemente (o criminalmente?) assemblate con lo scopo di testare il livello di sopportazione di questa o quella pianta. Lascio a un post specifico l’approfondimento dei substrati.

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