Yardeners' rules of (green) thumb

Yardeners shouldn't work on Sundays out of respect to Christians.
Yardeners shouldn't work on Saturdays out of respect to Jews.
Yardeners shouldn't work on Fridays out of respect to Muslims.
Yardeners shouldn't work on Mondays out of respect to those who work during the weekend.
Furthurmore.
Yardeners shouldn't be working in the morning out of respect to the people who work at night.