| The plant material, which forms deposits of peat locally, is likely the source of the phosphate. |
| You could dig the trench and fill it with sand or mulch or peat moss and make it easy to re-dig. |
| A common soil mix is one part sphagnum peat moss or composted bark or compost, one part vermiculite or perlite, and one part sand. |
| What about fertilizer, bone meal, peat moss, and all those other additives they are going to try and sell you at the garden center? |
| Bark, rotted manure, leaf mold, peat moss and compost are good choices for organic ingredients. |
| If you want to add any amendments, such as compost or peat moss, work them into the soil. |
