I've used 70% for the past 3 years, but my tomato patch is around 6,000 ft above sea level and my temps get over 100° very often with very very low humidity. My elevation causes higher solar radiation and the low humidity really kills the flowers, so the 70% shade cloth lowers temps up to 10° which enhances my chances for flowering a little bit. I install the shade cloth in June and take it off in early September. It saved me from some nasty hail this last season, although I was hit by a late hail storm in October.
|