The dirt on soil: Soil is perhaps the most important element when it comes to planting. Soil provides plants with a place to set down some roots. The properties of the soil need to be conducive to tender, new roots finding their way into the hidden underground world in order to absorb moisture and nutrients as well as form a strong foundation to support what is above ground.
Tahoe soils are lacking in fertility as well as moisture retention. In general most soils are 90% mineral residue and 10% organic matter. Our soils are poorly developed, coarse, and consist of decomposed granite. The first step to developing a rich, yummy, organic soil is amending.
Adding amendments boosts soil quality thus providing plants with a chance to grow and thrive. Soil amendments are any material that improves the physical properties (permeability, water holding capacity, porosity, texture, structure and compaction) of soil.
Amendments rich in organic matter like compost are excellent choices. Organic matter promotes microbial activity and attracts other beneficial creatures to the soil. As microorganisms break down organic matter and earthworms work their way through the soil the physical qualities improve creating a healthy soil. These critters continue to build up the soil making nutrients more readily available to plants.
Amend new planting areas by applying 3 to 6 inches of amendment and incorporating to a depth of 8 to 12 inches. Continue adding amendment each season to existing planting areas by spreading a couple inches in between vegetation and mixing carefully as not to disturb roots.
Basically you want to lay it on thick, mix thoroughly and let time do the rest. Applying compost directly to the surface of the planting area provides some benefit, but it will do its best work when blended completely with existing soil. Amending soil will also make digging a lot easier. Our groundwork for a healthy landscape is complete and now it is time to grab a shovel and get dirty.