Q: I was wondering how much drainage is necessary for the potted dwarf Alberta
I planted it in a container without holes or drainage of any
kind. Should I replant using stones/rocks on the bottom for drainage?
Since you have already put the spruce in the pot, I wouldn't dig it out and
shock it all over again. I would leave it there, and just drill drainage
holes up from the bottom.
1/2" to 3/4" in diameter should be fine. Drill 1
in the center, then 4 in a circle evenly spaced around the edges.
When you water (once every 7-10 days is the usual schedule), water until it
runs out the drainage holes. If the soil in the pot is compacted, this may
take a while.
If so, take a long-shanked screwdriver and punch holes in the
soil up through the drainage holes.