If I change the value of :rows, it works. But it stays at the default cols whatever value I set with \':cols =>\'. Column width won\'t change.
I viewed the html source a
This works for me with twitter bootstrap 2 and simple_form 2.0.4 Result is a span6 text area in a span9 row
<%= f.input :some_text, :input_html => {:rows => 5, :placeholder => "Enter some text.", :class => "span6"}%>