Trial and "Error" Can Be A Great Teacher....I have a vast quantity of arugula seeds from last season, so today I will experiment with an early sowing in a 20 gallon Restricted Drainage Container Garden made from a scavenged commercial tree pot just to see what happens. But I will plant an eggplant in the center as originally planned. For me, "risky" experimentation in the garden has been one of my best teachers since the mid 1970s in Seminole Heights where I rented two places.