Worth Using vermiculite with MPC for sowing?

[SarzWix]

Didn't know about the soaked in calcium bit Potty. Thankfully I don't use it anyway

[Two_Sheds]

I use ...vermiculite as a cover for very small seeds. Means - in theory - germination is easier.

That's what you have been led to believe/assume, but you need to do a trial really, to be sure.

I use MPC, peat free, not even sieved: yes, the big old lumpy stuff (I pick out the biggest lumps) and it does OK for me. My gh is full to the gills already with seedlings

[snakeshack]

I only use a very thin layer over small seeds ,especially chillis, as it allows the light to permeate but keeps the humidity up around the seeds,in my case it's mixed with tarantula manure but each to his own.

[Two_Sheds]

They both suffer from what seem to be hidden problems. The coir certainly isn't mined but like vermiculite the ships it travels in are made of steel and driven by oil. ... what ever we use it has its down side.

Absolutely.

It's up to those who care about the planet & its wildlife to always choose the least damaging option