Roll out the tubing along the flower bed, keeping it close to the base of the plants.
Keep unwinding the spool back and forth throughout the flower bed; space the tubing 12 inches apart.
If necessary, join one length of tubing to another with a push-in coupling.
When you get to the end of the layout, cut the tubing with a utility knife if necessary, flush it with water, fold it over, and slip on an end clamp.
TIP: Set the tubing in the sun for a few hours and it will soften and be much easier to install.