by 
The Curious Bag
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<h4 class="dechead">On One Hand: Add Compost When Preparing Soil
For a fall garden, like any other, it is a good idea to add compost to the soil when it is being prepared for planting and before you plant any seeds or seedlings. Mix compost into at least the upper 6 inches of soil to ensure the best delivery of nutrients to the plants.
On the Other: Add Compost as Mulch Anytime
Compost is best used when ready; if it sits for too long, there won't be as many nutrients available for your plants. If you have compost ready, or if you already have plants in the ground, you can add a 3-to-4-inch layer of compost to your current garden anytime.
Bottom Line
Compost has the most nutrients if used when ready, so if you have a batch prepared before planting your fall garden, mix it into the soil before planting. If you have already planted or if you have another batch ready later in the season, add it to the surface of the soil as a mulch.
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