Dogwood of 4 years
I've had a Dogwood in a ~20 inch pot on the deck for four years now. I'm looking to get some advice on how to keep this baby in good shape.
It has done consistently well despite limited sun (~4 hours) and the fact that I really don't know what I'm doing. I started out with standard soil from Home Depot topped with mulch. I add slow-release fertilizer (Osomocote) and some mulch twice a year. Last fall I trimmed the roots for the first time.
I've been doing some reading in this forum today and there are two things right away that I gather I'm doing wrong:
1) Using manure
2) Using standard soil
I'm also wondering about the tray on the bottom of the pot, which keeps a certain amount of water "on standby" so to speak. Should I remove this?
As far as the soil goes, am I going to need to replace it with something coarser? (I'm not even sure how one would go about doing that.) Or do you think the current soil and fertilization routine might be okay long-term?