Here's a question about poor soil: I have a lot of little trees and shrubs, and various large flowering plants in my garden... but I'm unsure whether or not I need to replenish the soil with more moist fertile dirt (since the dirt I have is minimal and retains no water after watering it) or do I cover the top of the existing dirt with bark mulch?  I'm really not sure what the benefits are of either....I just know that the dirt I have doesn't seem rich in any nutrients as the color is pale, and a dry, clay-like texture. Thanks to Leigh-Ann for the question. From what you've written about your soil, it doesn't sound as if it has much organic matter. It's the gradual breakdown of organic matter which supports beneficial organisms (like worms) in your soil, and eventually results in soil which can retain moisture, is darker in color, and has a crumbly texture. I'm a big fan of mulch, but adding bark mulch on top of your current soil might not give you the results you want. It takes a long time for bark mulch to break down, and in the meantime, it actually reduces the fertility of your soil (it nabs available nitrogen while decomposing). Over the long-term, it does add organic matter, but because of the way it's laid down, it doesn't incorporate well into your soil unless you later dig it in. Don't get me wrong - a good layer of mulch, over top of a good fertile soil, helps to retain moisture and reduces weed problems. Later worked into the soil, it can contribute to the long-term health of your garden. But in your current situation, I'd recommend you dig generous amounts of organic matter directly into your garden beds. You could grab some bags of steer manure or mushroom manure at the local garden center, but it's a pretty expensive way to go unless you're just doing a small area. You could also have a load of manure or compost delivered out - which might cost more at the time, but really pays off in the long run. Here in the local area (Abbotsford), Cannor Nurseries sells topsoil and soil amendments in bulk, as do several other nurseries if you call around.