I have grown 4 of these from two different sets of seeds. Of the plants I have, 3 have spines one has not. One of the three with spines has different coloured leaves - pale green while the others are lime green. Of the two left, one has longish, pointed leaves while the other has shorter, roundish leaves. All the seeds looked the same, except that one batch were smaller than the others.
Does this plant have a great many genetic types or varients, are they males and femails of two different varients, or are they responding to some other environmentl condition? They are all the same age, and sat on the same windowsill to grow. I am really quite puzzled. Anybody know??