Puya ferruginea - 2Ltr is unavailable at this time.
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Originating from Bolivia
They are 2 years old, have survived -6 degrees in an unheated greenhouse (we haven't tried them outdoors yet) and have grey/green leaves with the most nasty little inward facing spines. Here's the photo - you judge.
Grow in really well-drained soil in sun.
Eventual mature plant size :