Coir:
the prepared fiber of the husk of the coconut fruit, used in making rope, matting, etc. [Dictionary.com]
Noted in “Microgreens: The surprising truth about this trendy new ‘superfood’,” Chris Stokel-Walker, NewScientist (October 14-20, 2023; paywall):
I currently have a collection of mixed lettuce leaves growing alongside radish, mustard and rocket. Next to them, a couple of ice cream tubs house parsley, coriander and red basil seeds waiting to germinate, their roots exploring the coconut coir beneath – a growth medium derived from the husks of coconuts (see “How to grow microgreens”, below). Next on my wish list are peas, kohlrabi, broccoli and sunflowers.
