I've added compost to my potting mix for years and haven't run into any problems. I've also read some research that greenhouse growers are increasingly interested in compost-enriched potting mixes.

Don’t fill them with compost by itself. Add compost to soil before you plant. Spread a 3- to 4-inch layer of compost over the area you intend to plant. Mix the compost into the soil as deeply as ...

Mix, repeat. For some, composting is done without a second thought. For others, it’s a confusing process that may not seem worth the hassle.

Mixing compost within your trash can earn you a fine just like mixing paper, glass, metal, plastic and cartons within your trash can earn you a fine.