Compost ratio to garden soil - Knowledgebase Question

Watertown, WI
Question by psentringer
September 24, 2007
How much compost can be added to regular garden soil for growing perrenials?


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Answer from NGA
September 24, 2007

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The best approach is to spread a 4-5" layer over the top of the soil and dig it down to a depth of about 8". Plant your perennials, then mulch over the bare soil with another 2-3" of compost. This will suppress weeds, moderate soil temperatures and slow water evaporation. As this mulch decomposes you can dig it into the soil and add fresh compost. Best wishes with your perennial bed!

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