I appreciate it when subscribers reach out with their questions and concerns especially when we can educate each other and grow more responsibly.
Peat moss is a common substrate used in soilless mixes because it is a lightweight source of organic matter with good aeration and drainage. However, as our reader pointed out, it should not be overused or wasted. Peat moss comes from decomposed sphagnum moss in bogs and wetlands. Harvesting can degrade the ecosystems which do not recover quickly.
Some growers may prefer alternatives such as compost, coir or vermiculite. Compost is full of nutrients and can be readily available especially if you set up a system onsite. For the square foot garden, this is the best option to improve the soil. For container gardening, coir and vermiculite are two alternatives. Coir comes from the husks of coconuts and is more sustainable than peat moss. Vermiculite is a lightweight mineral commonly used as an alternative to peat moss because it is better at holding nutrients. These are a few options to consider when you purchase soilless mixes or make your own.