I also tend to "dry farm" my tomatoes. They are deep rooted and once established rarely need water beyond rainfall. This yerba our rainfall is less than half the norm yet my best producers are dry farmed plants from may 2011. Seriously. Once established, I've never seen a tomato plant wilt. If the drought turns extreme, they yes I would water. Extreme summer heat is a non-issue (93 max) here but irrelevant anyway since fruit doesn't set in that heat anyhow... So far this year my plants have seen only 8 inches of rain (norm would be 19).
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Wise selfishness is taking care of everyone else so that they don't bring harm to you.
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