My neighbor built his raised bed for his front yard. In order to fill the raised bed he needed dirt. One of our other neighbors had ordered dirt from a local landscape supply company that supplies all sorts of amendments rocks sand compost et cetera. I was completely unaware that there was a facility like this one a mile away from my home.
We went to the dirt exchange in Ballard under the bridge. They have various sorts of gravel in different sizes as well as mulch and dirt. They also carry several sizes of quarry rock from huge boulders to drainage fill as well.
We were there to get soil for raised garden beds. The staff at the dirt exchange suggested a soil mixture from two part or a three part. The two-part mixture consisted of equal amounts of sand and compost. The three-part mixture was made from sand compost and loam. The three-part mixture was light and drained well which is good for growing vegetables. We get a lot of rain and we do not want water standing to drown out small plants or to make roots rot. In some dryer areas of the country you might would want to have a small percentage of pine bark added to retain water to keep your plant roots from becoming too dry should you miss a watering.
After deciding which substrate to get the bucket was fired up and a yard of three-way veggie mix was dumped into the bed of the pickup truck. The three-way mix was made of finer particles and was light and had a slightly earthy aroma to it. Being light and airy is a good thing for plant roots. plant roots need water and they need oxygen. Soil that packs too densely will prevent water from draining properly which can lead to root rot and also limits how much oxygen the roots of the plants can get.