Its spring again, so you may be thinking about doing some gardening. There are a lot of things to consider these days when it comes to planting flowers, scrubs and trees. Here in Denver we always have to worry about water conservation. We always want to be kind to our environment be not using harmful chemical when it’s not needed. We also need to be careful about what we plant because certain plants can be harmful in a particular ecosystem. You should be aware of a several key concepts in modern gardening, especially when you visit your local garden center.Standards and certification are two of the more controversial topics surrounding the sustainability movement in 2008. Sustainability is a characteristic of a process or state that can be maintained at a certain level indefinitely. The...