When to use shade cloth
I'm a new-to-AZ gardener and was wondering at what temperature I should start using shade cloth on my tomatoes. I have one bed in an area that gets all day sun so I splurged on shade cloth to cover it, but I just don't know whether to leave the cloth on all day, just cover the area by noon, or wait till it gets even hotter. It's supposed to hit 100 degrees this weekend!
Also, since shade cloth from the nursery (Baker in Phoenix, in this case) is prohibitively expensive, I was wondering if others had experience using bed sheets, etc. as shade cloth.
Thank you in advance for any experience you can share with me!