If the seeds of 2 different varieites of the same plant germinate it isn't likely that the compost is at fault for the germination process. If 1 of the varieties then fails to thrive when transplanted each year using the same medium, perhaps best to stick to the 1 which does well rather than be frustrated by constant failure. Or I guess you could choose another variety along with the successful one and see if you have any more luck ? Many are finding purchased compost to be extremely variable in both quality and consistency - as already said, adding/mixing to suit what you are growing can work but it takes a bit of experimentation. If you aren't able to do that or it doesn't work for the chosen plant, time to think of alternatives.
I had disastrous results from the first bag of peat free compost that I used, it was the first year I had experienced failure in my hanging baskets and window boxes. I was not at all impressed. I now add home made compost to the mix and it gives OK results but not as good as they used to be.
I fully accept that many of us don't have lots of space for stocking multiple bags of product, but there are small bags of sharp sand etc that don't take up lots of room. I agee most of us just want to buy and use a product that works but given where we are we probably need to do this for a while yet. As I said there is advice out there about what to do, and what mixes to use.
I agree @Allotment Boy . I tend to use a standard compost and I just add grit or Perlite if it's for plants/seedlings that need really sharp drainage when in small pots for a while. I don't have lots of room to store large bags of varying bits and pieces in this property, as I only have a shed. It also depends on how much compost people need for what they're growing. My home made compost takes a long time to be viable for lots of plants, and as I grow quite a lot in containers, and for potting on cuttings and small plants, the amount of ready material after a year, isn't anywhere near enough. I could plant in the ground with some things I grow, but many of them would just be eaten overnight by slugs, so pots are easier to manage.
I think a lot of the poor quality material we've seen in recent years possibly comes from supply and demand - all those folk taking up gardening during lockdown, and there simply wasn't the amount of decent quality stuff available. You can't magic it up from nothing Hopefully, things will level out a bit though, and the quality will become more reliable, but it's not going to be an inexpensive product any more, like it was five years ago.
It's a place where beautiful isn't enough of a word....
I live in west central Scotland - not where that photo is...
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If 1 of the varieties then fails to thrive when transplanted each year using the same medium, perhaps best to stick to the 1 which does well rather than be frustrated by constant failure. Or I guess you could choose another variety along with the successful one and see if you have any more luck ?
Many are finding purchased compost to be extremely variable in both quality and consistency - as already said, adding/mixing to suit what you are growing can work but it takes a bit of experimentation. If you aren't able to do that or it doesn't work for the chosen plant, time to think of alternatives.
I think a lot of the poor quality material we've seen in recent years possibly comes from supply and demand - all those folk taking up gardening during lockdown, and there simply wasn't the amount of decent quality stuff available. You can't magic it up from nothing
Hopefully, things will level out a bit though, and the quality will become more reliable, but it's not going to be an inexpensive product any more, like it was five years ago.
I live in west central Scotland - not where that photo is...