You can override the regular addition by adding a new class to textarea and applying some css changes to it:
<div class="input-group-addon textarea-addon"> Description </div> <textarea class="form-control" rows="5"></textarea>
and for css:
.textarea-addon{ border-bottom-left-radius: 0px !important; border-top-right-radius: 4px !important; border:1px solid #ccc !important; border-bottom: none !important; } textarea{ border-top-left-radius:0px !important; border-top-right-radius:0px !important; }
If you use less or a compass, I would use variables instead of primes. In addition, you should add some browser compatibility properties (such as -webkit and -moz prefixes)
Real-time example: http://plnkr.co/edit/dMa4UPLMqOXdVITzFKNr?p=preview
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