Depends on what type of tissue you are going to extract the RNA from I guess.
I've had to use liquid nitrogen and a mortar and pestle to pulverize seeds as it's very tough and strong material.
Some softer tissues could potentially be broken down (on ice!) using a homogenizer I suppose.
I have only extracted from animals; however, have you looked into using TRIZOL? Again, I am not sure if it will work with plants, it isn't too expensive and may be worth a shot.
'TRIZOL' should be ok. After you get the tissue powder, you can isolate RNA using Trizol. But the problem is how to grind the tissue into powders without liquid nitrogen. The worse one is that you are isolating RNA. Without carefully handling it, your RNA will all be degraded away by RNase. Have you found a way yet?
You can use trizol to grind the sample. Then precipitate with isopropanol and then add to spin columns and elute it; you can get good concentration of RNA
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