Various members of this genus are big and bold and cope better with heat than many traditional annuals. Ornamental types are are grown for their flamboyantly coloured foliage or flower heads.
Some types of Amaranth are grown as vegetables or grain. Some of the vegetable types also have coloured foliage and/or seed heads and can be quite ornamental, too.
Other Information Online
An overview. Colorado State University
Love-Lies-Bleeding Amaranthus caudatus
. Whatcom County Extension, Washington State University