13 inches deep? Seriously?
My first planting of carrots (with parsley as late companion) this fall was started in late Aug. and just barely covered the seed.
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Second planting in early Sept. again just barely covering the tiny seeds with soil...
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Third planting late Sept. w/ buttercrunch lettuce companion, again just barely covering seed...
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Fourth planting, mid Oct companion planted with cabbage and again just barely covered seed...
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Fifth and final planting (until Feb.) just made today. We should have a continuous supply of carrots through next spring.