Every planting hole in the Garden-
Every pot- (almost)
For many years.
Springtime-
For established potted plants, if I'm lazy, I throw it in the top of the pot and mix the soil up lightly or top-dress afterward with a bit of fresh soil. If I'm in a more dedicated mood, I'll poke several holes with a stick or dowel down to mid-pot (root) level, drop some in and cover them.
For the front porch display pots- I use a measured dose of osmocote and water absorbing crystals together in the root zone when planting. They are in the scorching afternoon heat all summer long!
For up-potting seedlings, I don't mix it into the potting mix in a bucket, I carefully count and drop a few into each cell around the roots as I plant each seedling so I know all the cells get the same amount.
I still use liquid fertilizer during the year as well, but less with osmocote in the soil.
I do wish the coating was biodegradable- but I think they are working on that.
