Trees in bad soil - not draining good
I have a spruce tree I planted several years ago. It's still alive, but it doesn't seem to be growing (it's knee high). When I water it, the water just sits in the basin around the tree. I know I added compost and amendment to the soil prior to planting, but now it's been 4-5 years and I think it's suffering. Is there anything I can add to the soil to help? It is surrounded by river rock.
Then a few months ago, I planted a Hawthorn tree on another side of my yard. I dug extra wide and deep and added compost to the hole, but now when I water, the water is settling and staying on top with like a bubbly filmy white to it. I'm worried. But the tree looks great, its bloomed and leafed out. Again what should I put in this soil?
I live in Colorado Springs. The soil is rocky and hard, clay and sandy and definitly needs amendment which I always do when I plant.
Maybe I didn't add enough compost and mulch?