My favorite plants are monstrous, strange, and spiky. The more alien the better.
If they produce big lovely flowers, I make some allowances for also having plain
leaves. My garden features a selection of large cactus, succulents, and other prickly
things. Here are some of my best:
Cactus flowers:
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Front porch pots: 
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Flowering yucca: 
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Chrysler Imperial Rose (hybrid tea): 
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Flowering dracena: 
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Succulents at night: 
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Front porch cactus: 
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Front porch cactus: 
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Front porch cactus: 
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Front porch crest cactus: 
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Front porch crest cactus: 
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Striped agave: 
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Striped agave: 
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Baby agave: 
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Images Copyright 2003-2007 by Katy Dickinson and John Plocher
KatysBlog 
Wow, the agave is already of impressive size!!!! Good luck, Katy! BTW: does it flower?
Some agaves are called century plants because they are supposed to bloom once in a hundred years. However, they mostly bloom in 25 years. The plant that blooms produces a huge stalk then dies after flowering. I have found some new sources for agaves and information on them:
http://www.smgrowers.com (San Marcos Growers), http://www.plantdelights.com (Plant Delights), and http://www.yuccado.com (Yucca Do)