Grace mowed lawns for 63 hours at $6/hour, so earned 63 * 6 = $<<63*6=378>>378.
Grace pulled weeds for 9 hours at $11/hour, so earned 9 * 11 = $<<9*11=99>>99.
Grace put down mulch for 10 hours at $9/hour, so earned 10 * 9 = $<<10*9=90>>90.
During September Grace earned $378 + $99 + $90 = $<<378+99+90=567>>567.
#### 567