Stucco is difficult, at best to try to match if it's aged at all. So any work you do will stand out as a patch, unless you re-paint the entire face of the wall you cut into.
If that pot is the only thing you water from that pipe (can't tell if the pipe supply comes up from the ground to the "T" or from the right) they make tan piping for the line you want to run to the pot, so it won't stand out as much, and could be re-done smaller all the way arouund. 50' 1/4" Tan Water Hose - shorter lengths are available, just got this first click.
Sorry, that link was to misting line. I’m not sure it’ll hold up to irrigation pressures. They make a brown color for irrigation, but not as light as that.