It is impossible to start seeds directly in the clay balls because the seeds would fall through the spaces to the bottom of the medium. There are several ways to deal with this situation. You could start the seeds in small Oasis cubes or small pieces of rockwool that are set into the clay pellets. There are other solid mediums that are available as well.
The planting mediums you mentioned require a container to hold them. They will eventually mix with the pebbles, polluting them.
By germinating in the planting space, the plant’s roots aren’t disturbed by transplanting.
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