Amending Heavy Clay Outdoors

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Clay soil holds water and stays cold, which is the opposite of what a sativa root system wants. Digging a large hole and filling it with a mix of compost, perlite, and the native soil gives the taproot somewhere to go and drains quickly enough to avoid rot during a wet spring. The outdoor soil preparation guide on https://hazesativaseeds.com suggests preparing the holes the autumn before and lists amendment ratios that worked for their trial plots on heavy ground. Raised mounds are another option if digging deep is not practical.