Compost Use and Soil Analysis
Excavate a planting hole equal in depth to the root mass, and 2 to 3 times its width. Place the root mass on firm soil so that the top of the root mass is level with the soil surface.
For shrubs, bulbs and herbaceous plants: uniformly blend a 3:1 ratio1 (v/v) of soil and compost where soils are sandy in nature, or subsoils. Use a 4-5:11 (v/v) soil and compost ratio when planting species that require low nutrient levels, or on sites where soil quality is more favourable.
For trees: use a 4:1 ratio1 (v/v) blend of excavated soil and compost. Place blended soil around the root mass, firming occasionally. Do not apply fertilization in the backfill material, or at time of planting. Water thoroughly after planting.
Take note that the addition of compost may reduce the required frequency of watering. In almost all landscape applications, the addition of pre-plant fertilizer can be eliminated when a stable compost is applied at recommended rates.
Soil analysis
Before any soil preparation procedures ensue, a soil analysis shall be completed by a reputable laboratory to determine any nutritional requirements, pH and organic matter adjustments necessary.
Notes
The Landscape Architect/Designer should specify the compost inclusion rate depending upon soil conditions and quality, plant tolerances, and manufacturer's recommendations.
These recommendations may require modification for plant species requiring minimal fertilization, and those that are lime-hating, such as rhododendrons, camellias, etc. Typically, compost should not be used where limehating species are to be planted.
