What does flower-sprigged mean?

A plant sprig is a term for the small shoot or branch of a plant. "Spriging" is a method of asexual reproduction, where many small pieces of a plant are taken and planted, these then produce roots and leaves - very much in the same way as cuttings (where cuttings are a more presice "art").

The practice of spriging is used in a number of countries, largely to increase the size of turfed areas (particularly in the Middle East); short stolons are removed through verticutting, these are then laid out and covered with soil and watered. Probably about 90% of these develop into new grass stolons.