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Two on three seeds opened after 60 hours. I put them directly into cubes of rock wool, sunk about 5mm to 1cm.
Day 3, I put them in 15x15cm pots, filled with "canna coco professional plus". I fed 4ml/l of rizotonic and 0.5ml/l of coco AB. A seed died, it failed to open the hull sufficiently and rotted inside.