It isn't necessarily a bad idea, you'll just end up with a hodge-podge foreground.
I think you'll also find that one or two of the plants you use in your "mixed foreground" might not follow its intended growth pattern.
The Hm and Glosso for instance. The Hm will overtake the Glosso most likely. While it will look pretty cool for a while the Glosso growth would probably be more upright than ground hugging as it fights the hm for light. In turn, the faster growing Glosso would most likely overtake the slower growing Hc.
Mike
I think you'll also find that one or two of the plants you use in your "mixed foreground" might not follow its intended growth pattern.
The Hm and Glosso for instance. The Hm will overtake the Glosso most likely. While it will look pretty cool for a while the Glosso growth would probably be more upright than ground hugging as it fights the hm for light. In turn, the faster growing Glosso would most likely overtake the slower growing Hc.
Mike
