Where do I find quality, competent hortictultural centers?
Ask around. Try a botanic garden if there’s one nearby. Look at the advertising each place does. Is any of it leading edge? Is all of it price-oriented? (Avoid the price people at all costs.) Find a topic that you know the correct answer to and call all the garden centers; ask them the question and wait for the answer. If it’s bullshit, then you know: incompetents and avoid them too. But if someone does the research and provides the correct answer and some other creative solutions to your problem, make them your place of business. There are some very good places out there. Use them as a resource and patronize them frequently. Once a rapport and relationship are established, stay with them. Changing just due to price is the surest way to get back to the incompetent places of business again.