> From: gomberg at wcf_com (Dave Gomberg) > > Can someone explain to me if substrate heating coils are so absolutely > essential to breathtaking plants how Mother Nature does without them? A. Heating coils are definitely not essential for great plant growth but will/may lead to great plant growth in the long term. 2. Mother Nature has various clever ways to mimic the supposed effects of heating coils ... or is it the other way around :-). George