According to @Adrish , planting drugs in an unowned property is breaking 3.9. I myself, have grown a few times in an unowned property and, for example even been caught IC by @TinySlayer whilst growing in unowned office. He never said anything to me about it so specify it in the rules for clarification. I don't see how drugs are props, so you should be able to place them where you like. Rule 3.23 Placing Drugs doesn't say anything about not growing in unowned properties.