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Tag: pioggia

I cactus, la primavera che non arriva e la pioggia che non dà tregua: dobbiamo preoccuparci?

Una primavera che stenta ad affermarsi, temperature che oscillano in continuazione con giornate soleggiate e molto calde e giornate uggiose col termometro in picchiata. Soprattutto, pioggia fitta quasi tutti i giorni da almeno una settimana, quantomeno qui al Nord. Molti, tra noi, hanno già trasferito le loro cactacee e succulente all’esterno, o hanno tolto le protezioni invernali (tessuto non tessuto o teli trasparenti). In tanti si preoccupano, alcuni corrono ai ripari riportando le piante al coperto, altri sono indecisi sul da farsi… E’ davvero il caso di preoccuparsi per la combinazione tra basse temperature e pioggia insistente?

Ecco in questo articolo qualche riflessione e la risposta alla domanda che in tanti mi state ponendo in questi giorni, come sempre sulla base di quello che ho imparato in anni di coltivazione (…).

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Quando il cactus “esplode” per la troppa acqua: come evitare le spaccature sul fusto

Le piante succulente, e le cactacee in particolare, si sono evolute per accumulare riserve idriche e riuscire così ad affrontare lunghi periodi di siccità. Nei loro habitat naturali, i cactus sono soggetti a forti sbalzi di temperatura tra la notte e il giorno, ma anche ad un’alternanza tra periodi di totale siccità e periodi di grande disponibilità di acqua.

Nelle regioni subdesertiche degli Stati Uniti meridionali (California, Arizona, Texas, Nevada, ecc.), così come in Messico, nell’America centrale e nell’America latina (Cile e Argentina, ad esempio), durante la stagione vegetativa, corrispondente di fatto alla primavera e all’estate, le giornate calde e secche sono spesso interrotte bruscamente da violenti acquazzoni. (…)

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Come, quando e quanto bagnare le succulente? Scordatevi il contagocce, benvenuta la pioggia

Quello delle annaffiature (o innaffiature, sebbene il primo termine sia oggi di uso più comune) è tuttora uno dei temi più dibattuti tra chi si approccia alla coltivazione di cactus e piante grasse in generale. Quanta acqua vogliono i cactus? Quando vanno annaffiate le piante succulente? Ogni quanto vanno bagnate le piante grasse?

Un'Agave in Arizona
Un’agave che ho fotografato in Arizona. La siccità colpisce duro ma la pianta ha riserve per andare avanti per mesi senza pioggia

Quelle riportate in apertura sono solo alcune delle domande più ricorrenti – e sorvolo, per ovvi motivi, su un’altra domanda che ho sentito spesso porre: “Ma i cactus vanno annaffiati?”.
Come ogni essere vivente, le piante succulente hanno bisogno di acqua. Come, quanto e quando annaffiare dipende da molti fattori, come il periodo dell’anno, la zona in cui ci si trova (Nord o Sud Italia, ad esempio?), le temperature, l’umidità ambientale, i substrati che si utilizzano, la grandezza dei vasi, e altro ancora.

Sulla coltivazione delle piante grasse in generale potete consultare questo articolo riassuntivo, con tutti i fattori determinanti per avere piante in salute.

Vediamo, in questo articolo, tutto quello che è opportuno sapere in relazione alle annaffiature delle succulente e dei cactus, così da avere piante sane ed evitare i marciumi.

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