New garden on shale soils. - Knowledgebase Question

Duncannon, Pe
Question by amschref
April 21, 2009
I'm starting a new flower/shrub garden - the yard seems to have shallow shale throughout (central PA). Grass is currently growing in the area I want to put the garden. There seems to be about 3-5 inches of soil before we hit some kind of shale or fragipan layer. Do I need to add soil? Is there a type of mulch that is better than others (I'd prefer

Answer from NGA
April 21, 2009


Three to five inches of soil will support turfgrass and some annual flowers, but not perennials, shrubs or trees. If you can't dig down and break up the shale you might want to bring in some topsoil and make mounds or raised beds in which to plant perennials and shrubs. If you order topsoil, order a 3 way mix which is a combination of garden soil, sand and compost. This makes great soil for gardening because it drains well and has some nutrients in it. You can add some extra compost, aged manure, or other organic matter to help build it into rich garden loam. Best wishes with your garden!

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