Soil Augmentation for Shrubs and Trees

Asked October 12, 2018, 1:09 PM EDT

Several years ago we replaced a railroad tie retaining wall with a rock wall. In the process we removed all the existing shrubs and trees along with some soil. When the new wall was complete we filed in with top soil and then a couple inches of hemlock bark. This has been in place three years. We are now planning to plant shrubs and a couple small trees in the area. Should we do a general augmentation to all of the soil or add the appropriate nutrients to each specific plant? Attached are three photos of the site.

Lane County Oregon

1 Response

Very nice look to the front. Would you consider doing a soil test to that soil to know just what is needed and what is not? It is not too expensive and may safe money and effort later on. It will tell you the pH and the nutrients already present.
Has the bark all broken down by now? Shrubs and new trees will require much the same nutrition as a rule. There is a soil testing lab in Eugene and the Lane extension office has a listing of soil labs at the office. Call the Master Gardener hotline at 541-344-0265 M-Th 10-1 and 2-5. If you still have unanswered concerns, please just get right back to me.