Custom Potting Soil Recipes for Different Plant Types

Question: Can you give me a good general potting soil recipe for flowering plants I've rooted to sell?

Tailored Mixes

For most herbaceous plants: 70% ground sphagnum peat moss, 20% pine bark fines, 10% perlite.
For woody plants: 70% pine bark fines, 20% compost or peat, 10% coarse sand.

These are good starting points. Test various formulas—we grow 400 perennial varieties at our nursery using four different soils, still modifying for specific plants.