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Il fiore tra le spine

Mese: Dicembre 2020

Quando ripicchettare le semine di cactus, come farlo correttamente e quale terriccio usare

Parlando di semine di cactus, una domanda molto frequente e non di rado posta con un discreto livello di (inutile) apprensione, è: dopo quanto tempo si devono ripicchettare i semenzali? Ossia, quando le giovani plantule hanno bisogno di essere rinvasate e magari divise in vasi singoli? Anche in questo caso, così come in moltissime altre “faccende da cactofili”, la risposta dipende da diversi fattori legati alla coltivazione. Sulla base dell’esperienza è tuttavia possibile dare indicazioni di massima utili soprattutto a chi sperimenta la semina per la prima volta.

Vediamo allora nel dettaglio, in questo articolo, tutto quello che c’è da sapere riguardo a questo passaggio fondamentale per la corretta crescita di piante da nostra semina. (…)

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Titanopsis calcarea, una succulenta a fioritura invernale con regole di coltivazione particolari

Dalla metà di dicembre all’inizio di gennaio è tempo di fioritura per una pianta succulenta piuttosto diffusa e molto apprezzata dal punto di vista estetico: Titanopsis calcarea. L’aspetto delle foglie, la loro disposizione, il colore e i rilievi puntiformi (simili a verruche) sulla superficie carnosa delle foglie stesse fanno di questa pianta  una piccola roccia vivente, al pari con i Lithops. E non è un caso che il nome Titanopsis derivi dalll’unione dei termini greci “titanos” (inteso come “gesso”, “calce”) e “opsis“, ossia “aspetto”. Insomma, pianta dall’aspetto di una roccia calcarea o di un “grumo di terra” (l’efficace definizione è di Giuseppe Lodi), potremmo definirla.

Il genere Titanopsis appartiene alla famiglia delle mesembriantemaceae (ex aizoaceae) ed è originario dell’Africa del Sud, in particolare della Namibia e della Provincia del Capo. La coltivazione di queste piante, e nello specifico della Titanopsis calcarea, richiede qualche accorgimento particolare rispetto a quelli che riserviamo alle cactacee. Entriamo in dettaglio nell’articolo che segue (….).

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Mammillaria luethyi, l’incredibile storia della sua scoperta e tutti i consigli per coltivarla

A differenza di quanto avviene di regola con le cactacee, Mammillaria luethyi fu osservata per la prima volta da un ricercatore non in habitat bensì in un… barattolo da caffè. Strano? Aspettate di leggere la storia per intero, allora. Sì, perché la scoperta di questa specie di Mammillaria è relativamente recente (metà anni Cinquanta del Novecento) e ancora oggi non la si può certamente definire una pianta diffusa in coltivazione o facilmente reperibile sul mercato.

Eppure, tra le Mammillaria, è una delle specie più affascinanti in assoluto, una tra le più intriganti e senza dubbio quella con la fioritura più appariscente e al tempo stesso delicata e ammaliante. A far da contraltare a questi pregi ci sono le difficoltà di coltivazione e la propensione al marciume radicale, e sono probabilmente questi elementi, oltre alla lentezza nella crescita, a confinare la luethyi in quell’angolo in cui solo i veri appassionati e i cactofili esperti sono in grado di muoversi (e non sempre con facilità).

Conosciamo meglio questa spettacolare specie di Mammillaria e vediamo come è possibile riuscire a coltivarla con successo, con un minimo di esperienza e i corretti accorgimenti, che cercherò di riassumere, come sempre sulla base della mia esperienza diretta, nell’articolo che segue. (…)

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