Planning a raised bed garden always starts with so much...

Planning a raised bed garden always starts with so much promise. Credit: TNS/Getty Images/vm

Planning a raised bed garden always starts with so much promise. But in your enthusiasm, it's easy to make mistakes that can derail the effort. Here's what to avoid doing so you can garden smarter, not harder.

Picking the wrong spot

Your raised bed should receive at least six hours of direct sun each day. If you're siting your location in early spring, consider what surrounding trees will look like come summer and where their shade will fall. Pick somewhere relatively flat, but avoid low-lying areas such as the bottom of a hill where rainwater collects. Putting raised beds against a fence or wall means you won't be able to access all four sides easily.

Forgetting about a water source

The back of your yard may be a logical place to put your raised bed, but not if you have to lug buckets of water to tend to them. Make sure it's close enough to an outdoor faucet that a garden hose can reach. Also, consider installing a drip irrigation system to keep your bed consistently watered with minimal waste.

Making the beds too big

While creating a large plot is tempting, it's crucial to keep logistics in mind. Your plot should be narrow enough to reach halfway across it to plant, weed, water and harvest in the middle. Avoid making it too long; you don't want to become frustrated walking in giant circles around your plot. If space allows, you could create multiple smaller raised beds.

Building with the wrong materials

Durable, long-lasting pressure-treated lumber may seem like a solid material to use, but many gardeners avoid it because of the risk of harmful chemicals leaching into the soil. On the other hand, avoid using wood prone to decay or already showing signs of wear, such as from a pallet, or you may have to rebuild. Instead, opt for cedar, oak, redwood, stones and bricks, which make long-lasting, chemical-free choices.

Not using the best soil

The bag may say garden soil, but it's intended to be mixed with existing in-ground topsoil to help improve its texture and nutrient composition. When used in raised beds, it can become compacted and inhibit drainage. Use bagged soil specifically designed for raised beds, which also has the advantage of being sterilized to kill any weed seeds, insects or diseases.

Selecting oversize plants

When planting within the confines of a raised bed, consider the scale and mature size of what you want to plant to ensure you have enough room for some variety. For example, a single zucchini plant would take up an entire two-foot square plot. If you're tight on space, plant smaller vegetables, opt for dwarf varieties, and practice succession planting.

Skipping mulch

Even though your garden is off the ground, it's still prone to weeds. Make sure to add a layer of mulch to help keep weeds at bay. The mulch also will help retain moisture around your plants' roots, so you won't have to water as often. Plus, your produce will be cleaner because mulch prevents rain from splashing soil onto your plants.

Not protecting your plants

While a raised bed may be enough to keep rabbits away, you've likely just put your precious produce at eye level for a hungry deer. The best way to deter deer is to install fencing you can easily reach over or remove to tend to your garden. You can also sprinkle an odor-based repellent on the soil, but it must be reapplied regularly.

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