
Alisma
Certified GKH Gardening Expert
Certified GKH Gardening Expert
Answered on April 18, 2017
It sounds as if you might have a hardpan layer under the 6" of soil, leading to drainage problems. Sometimes it is possible to drill through hardpan, other times it is possible to add drainage tiles or to improve drainage and plant health by adding more soil on top to raise the level of the ground. These articles will give you some advice:
http://goodlifegarden.ucdavis.edu/blog/2011/08/how-to-improve-your-soil-drainage/
sacmg.ucanr.edu/files/163130.pdf
http://ceventura.ucanr.edu/Gardening/Coastal/Landscape_578/Hardpan/
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