Sweet potatoes grow best in light, sandy soils but grow well on heavier soils, high in clay and amended with organic matter. Full sun requires direct light at least 6 hours/day; prefers 8 - 10 hours/day. Days to maturity: 85 - 120. Spacing: 12" in-rows x 40" between row.
What is the best fertilizer for sweet potatoes?
Sweet potato vines thrive best when a balanced slow-release 10-10-10 or 12-12-12 fertilizer is applied.
I highly suggest you would mix top soils with any dried leaf, mulches and cow/chicken manures (bought at Home Depot or Lowes , around $2-$3/bag). Sweet potatoes will produce high yields with this kind of mix soils.
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