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My Norway spruce seedlings grew up an inch and then stopped growing.
They get half day sun and kept moist when they dry out.
They have been fertilized once a month.
I lost a few when they dried out more in the heat of summer.
Is there anything I could do to make them grow a bit before winter kills them all?
Any suggestions would be greatly appreciated.

In their first year they don't grow a lot. They mainly produce a steady root base then. From the second year they should take off.
Maybe some pics to see if they are ok?