Q.I would like to make my own soilless potting soil to use in my greenhouse. What are some ingredients and varieties you could
suggest? I have heard about using pine tree which I would like to compost, especially pine tree fines, mulch etc. I would love any info on my interests. Suggest any and all info on the above. Please include any and all knowledge, even what you think and have experienced from best to worst, if you have the time. I am learning and am so interested in gardening from making compost to producing the best of outcomes for the finished product, purely for my own interest. thank you.

Certified GKH Gardening Expert
We don't recommend specific products, but here are two articles that will answer your questions:
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/soilless-growing-mediums.htm
https://www.gardeningknowhow.com/garden-how-to/propagation/seeds/soilless-seed-mix-info.htm