There is provided a turf cup assembly that attaches to a buried pop-up type sprinkler to blend a top of sprinkler both cosmetically and functionally with turf surrounding the sprinkler. The turf cup assembly includes a turf cup and a sleeve. The turf cup mounts to a riser of the pop-up type sprinkler. The turf cup contains soil and root structure of turf. The sleeve surrounds the turf cup and attaches to a top of a housing of a pop-up sprinkler. The sleeve can be at or slightly below grade, and the cup extends out of the sleeve during an irrigation cycle and retracts into the sleeve at the end of the irrigation cycle.

An irrigation sprinkler has a vertical axis (A) and is configured to emit a liquid jet. The sprinkler includes a base and a head operatively connected to the. A reciprocal element rotatably mounted to the head is configured to undergo reciprocal motion about the vertical axis (A), in response to being impacted with the liquid jet from a nozzle belonging to the head. The reciprocal element has a diffuser arm which carries a plurality of integrally formed, spaced apart diffuser posts which are configured to be hit by, and diffuse the liquid jet during the reciprocal motion.