Unfortunately, we have now distanced ourselves so far from our Earth/dirt/nature-centered origins that we have lost that breath of magick. Even in 2011, it is still true that survival depends on a successful harvest. Without a good grain harvest, there is no bread. Without healthy soil, there are no vegetables or fruit. We can live without meat, but we can't thrive completely without protein, carbohydrates and other nutrients, so we still depend on the land around us for our existence the same as did the ancients.
Sure, we can eat man-made "food" chemically manufactured in a pollution belching factory, sustenance nearly devoid of nature or natural qualities, but is that living? We are gardening magickally when we consciously intend to rise above living life on auto pilot and realize our connection to the food we eat, to the land we harvest it from and even more, its connection to us. When we realize the connection between every particle/atom/quark in the world--man, animal, plants, trees, factories, airplanes, good things and bad, then we realize that nature is a type of magickal force all its own. We truly are all ONE as the popular New Age saying goes. The question is: do we choose consciously to be one with a beautiful forest full of trees furnishing us fruit and nuts or a factory producing toxic waste to kill what's left of the healthy Earth around us?