SimpleXML feed showing blank arrays - how do I get the content out?

I'm trying to get the image out of a rss feed using a simpleXML feed and parsing the data out via an array and back into the foreach loop...

in the source code the array for [description] is shown as blank though I've managed to pull it out using another loop, however, I can't for the life of me work out how to pull in the next array, and subsequently the image for each post!

help?

you can view my progress here: http://dev.thebarnagency.co.uk/tfolphp.php

here's the original feed: feed://feeds.feedburner.com/TheFutureOfLuxury?format=xml

$xml_feed_url = 'http://feeds.feedburner.com/TheFutureOfLuxury?format=xml';
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $xml_feed_url);
curl_setopt($ch, CURLOPT_HEADER, false);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
$xml = curl_exec($ch);
curl_close($ch);

function produce_XML_object_tree($raw_XML) {
libxml_use_internal_errors(true);
try {
    $xmlTree = new SimpleXMLElement($raw_XML);
} catch (Exception $e) {
    // Something went wrong.
    $error_message = 'SimpleXMLElement threw an exception.';
    foreach(libxml_get_errors() as $error_line) {
        $error_message .= "\t" . $error_line->message;
    }
    trigger_error($error_message);
    return false;
}
return $xmlTree;
}

$feed = produce_XML_object_tree($xml);

print_r($feed);

foreach ($feed->channel->item as $item) {
// $desc = $item->description;

echo '<a href="'.$item->link.'">link</a><br>';

    foreach ($item->description as $desc) {
        echo $desc;`


    } 
}

thanks