Seed starting is about to get underway again so I needed to mix up some potting soil. I used to just use pro-mix but it gets quite expensive once you start doing alot of potting. You are looking at saving about 50% when you mix your own. Here is my recipe:
3 parts peat moss
1 part compost
1/2 part vermiculite
1/4 part pearlite
2 cups dolamitic lime (based on a 23.75 gallon batch, adjust accordingly)
I measure all parts with a 5 gallon bucket, this simplifies the process. The real key to this mix is the dolamitic lime. Peat moss is acidic and the dolamitic lime gently neutralizes the acidity, making for happier seedlings & plants.
I start by screening the peat moss into a wheelbarrow and gradulaty add the dolamitic lime. With that done I screen the compost into the wheelbarrow. Screening is not imparative but it does remove alot of sticks and clumps that little seedlings don't like. Leaving the sticks in also robs the soil of nitrogen as they break down.
When the soil is prepared I then added the vermiculite & pearlite. Then everything is mixed thoroughly with a square shovel.
Here is the final product. It is airy, holds moisture well and should make for some happy plants.
5 hours ago