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

Semina spontanea onzuka

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 soprese, come è capitato a me in questi giorni.

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

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