Ive been trying to set up the hydroponics in the green house at my high school. The problem is that most of the water evaporates so quickly that it is hard to keep the plants from drying out. the thermometer in there read 112 degrees today. when i asked my dad if he had any suggestions about what was wrong, he said that he used to have to put some sort of lime stuff on the green houses he used to work at during the summer to deflect some of the heat outwards. I live in California, it gets to about 106 degrees here in the summer and its not likely to rain till fall. What exactly is this lime stuff, and where can i get some. A recipe would be nice.
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