Two falls ago, I planted several new shrubs in my back yard which has clayish soil. When I planted, I put compost and a fertilizer in the hole prior to planting. I then put newspaper and mulch on top of the ground after I planted the shrubs..
Do I need to fertilize the plants periodically? How do I do that? Do I have to scrape all the mulch back before adding fertilizer?
The plants in question are strawberry trees, hebes, heavenly bamboos, and cotoneasters.