Seed Planting Density
Location: Outside U.S.
Country: United Kingdom
Date: Spring 2011
Does planting cress seeds more densely cause them to germinate more quickly, and to grow taller?
Yes, this can be expected as a result but not the optimum for growing
These three Q & A look like the exact same question you are asking:
This explains how best to plant cress seeds:
Anthony R. Brach, PhD
Missouri Botanical Garden c/o Harvard University Herbaria
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Update: June 2012