Local compost is less sexy, but it's better for the planet.
The outer coating of a coconut, called “coconut coir,” is surprisingly useful for starting seeds or mixing with other soil mediums. “It wets up nicely and holds water,” Jackson says. The downside, though, is that processing coconut coir requires a lot of water, so ocean salt doesn’t end up in the final product. And if you live in the US, you probably can’t buy local coir and might find it hard to get.
While these are important considerations, every growing medium has some sort of environmental impact—choosing is a matter of mitigation, not elimination. And, as always, we can only make so much difference on the individual level. “It’s a lot different than the professional individuals who are using growing media to grow vast acreages of crops,” says Jackson.
: how well the soil can hold positive ions, which hold on to nutrients. “[The CEC] is quite high in peat moss, but it also can be very high in aged and composted barks,” Jackson says.The antimicrobial activity of peat moss seems to be the hardest attribute to replicate, as mosses produce a complicated mix of substances like polyphenols and carbohydrates that have
, according to a 2015 paper in the journal Molecules. “There’s no direct substitution for it,” Jackson says.
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