"Chard" seems to be "sølvbeder", also called "bladbeder", I only used the word in plural in my garden, can probably be used in singular as well, "en sølvbede/en bladbede".
To be sure we are talking of the same plant, here is a link to pictures of sølvbeder:
https://www.google.com.ph/search?q=%22chard%22+(Beta+vulgaris,&rlz=1C1CHBF_enPH806PH806&source=lnms&tbm=isch&sa=X&ved=0ahUKEwjx1obnnvXcAhXRfCsKHTynDYAQ_AUICigB&biw=1366&bih=631#imgrc=R9oKMe0ZV0T2tM:
August 17, 2018
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