Hi Diana
Have grown lots of different Amaranthus over the years, and didn't realise until recently that you can eat the young leaves of even the ornamental varieties ! Similar to spinach, apparently !
Sorry, have not tried the Cereal Grain one, but I'm tempted, as it looks a stunner ! :)
Found this info on Chiltern Seeds website. Hope it helps.
Botanical Name: AMARANTHUS HYPOCHONDRIACUS Cereal Grain Amaranth, Golden Variety Amaranthaceae Cereal Grain Amaranth, Princes Feather
Genus: AMARANTHUS
Species: HYPOCHONDRIACUS
Variety: Cereal Grain Amaranth, Golden Variety
Family Name: Amaranthaceae
Catalogue No.: 85F
English Name: Cereal Grain Amaranth, Princes Feather
Description: If we had an Agricultural Section in this Catalogue, we could put this item in it; we could also put it in our Vegetable Section but, as you are most likely to grow it for its decorative qualities, we’ve decided to put it here. A beautiful ornamental, it is much cultivated in the Andes as a cereal crop. This variety has highly nutritious, white seeds that are excellent popped or ground into flour for use in breads, soups, porridge and, of course, tortillas. Although usually considered a half-hardy annual, there should be enough seeds in a packet to make trying a direct sowing well worthwhile. 3-6 ft.