This is another reason why I don’t like using compost containing recycled green waste, the weed seeds and liverworts that develop within days of being transferred out of a bag, into a pot and exposed to the light. The high temperatures achieved composting on an industrial scale is reckoned to kill these seeds but the evidence suggests otherwise.

Echinaceas potted on a week ago into cheap peat free compost containing recycled green waste

If you leave them, in a couple of weeks it gets worse.

Three weeks after potting on these astrantias, the weed seeds and liverworts have taken hold.

I never get this problem with peat based products and it is evidence that the manufacturers have still got a long way to go to produce viable  peat free alternatives.