Garden design is often broken down into design principles: Order/Balance/Proportion, Harmony or Unity and Flow, Transition or Rhythm. These categories contain the basic elements that, when combined together, constitute the generally accepted version of good garden design.
Leaves falling from the trees along with vegetable and bedding plants dying off as the season draws to a close means there can be lots of plant material accumulating around the yard. That makes now the ideal time for starting a backyard compost pile.
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Organic Gardening 
