Raised beds, containers, cedar planter boxes: who can tell the difference when there are so many options out there? To keep things simple, let’s go with the most common definitions.
A raised garden bed is a large frame that sits directly on the ground with its bottom open to the soil beneath. A planter box has a solid bottom that sits on four or more legs, raising it off the ground. Both options let you grow an abundance of food and flowers, though raised beds tend to be larger, with more soil volume. Learn more with our planter box ideas for backyard growing.
What are planter boxes made of?
While there are as many different materials as there are planter box sizes, a few choices are popular for a reason. The wood planter is a common, low-cost choice that is easy to DIY thanks to readily available materials. Long lasting options include cypress, redwood, and cedar.
Other materials commonly used in outdoor spaces include moulded concrete or aggregate, galvanized or coated metal, and combination wood-and-metal.
Why grow in planter boxes?
There are many reasons why you might want to grow edible or ornamental plants in planter boxes. Here are some important benefits to consider:
- Great for small-space gardening: Planter boxes work well on patios, porches, balconies and more. They’re available in a variety of shapes and sizes, and can transform small outdoor spaces into lush mini-gardens.
- Perfect for gardening on hard surfaces: The legs on planter boxes lift them off the ground completely, meaning there is minimal opportunity for staining your patio or concrete. When water does drain out, it will usually dry quickly since it’s not trapped between two surfaces.
- Fewer pests: Thanks to their height, planter boxes are often out of reach for ground-dwelling creatures like rabbits, moles, gophers, and more. Insect pests may still find your crops, but the small space close at hand means they’re easier to control. Beneficial insect controls work great in planter boxes!
- Helps combat soil-borne diseases: Planter boxes thrive with light, rich soil. Using a sterile container mix means preventing the common diseases associated with in-ground gardening.
- Easy access: If you find bending and stooping difficult, elevated planter boxes can help raise gardening to an easier level.
Related: Gardening on Concrete with Raised Beds and Patio Containers
How to get the best results from planter boxes
With all these benefits, it’s easy to see why gardeners love planter boxes. Thankfully, growing successfully in boxes of various sizes and styles isn’t difficult. But it’s worth considering the following tips to get the most from your planters.
1. Use a soil mix designed for planters and containers.
While it might be tempting to fill your planters with garden soil, please don’t fall for that particular temptation. The soil that fills in-ground gardens is heavy and dense. That’s a poor combination for container growing.
Instead, choose a sterile mix designed for planters and containers. These mixes will usually include ingredients to aerate your soil and keep it light (such as shredded bark or coconut coir), materials to increase soil filtration and retention of nutrients (perlite, pumice or vermiculite), along with compost or other organics. They might even be soil-free.
Using the right soil mix for your planter box will help ensure your plants won’t dry out and will get the nutrients they need.
2. Ensure your planter box has adequate drainage.
In addition to filling your planter with well-drained soil, be sure your planter box isn’t watertight. This can happen when converting basins or watering troughs into planters. The water needs to escape somewhere or your plants’ roots can get waterlogged.
Wood planters often have slots where the wood comes together. In these cases, water can usually escape. In other cases, extra drainage will be needed. Drainage holes should be about 9” apart and no smaller than ¾” in diameter.
3. Choose the right size box for your plants.
Garden planter boxes offer ease and versatility. Not only can you find L-shaped and U-shaped planters along with the standard rectangles, you can also find them in a variety of sizes. The question is, how big should you go?
Measuring your space is the easiest way to determine what length and width planter will best meet your needs. If your planter is two feet or narrower, you won’t need access on both sides to tend your bed, since you should have no trouble reaching across. Anything wider, and you’ll need access from both sides.
But what about depth? How deep should a planter box be for flowers? While most vegetables will grow well with under 24” of soil, some varieties need up to three feet. These are usually not the best choices for planter boxes. For more information, see
Raised Beds: Soil Depth Requirements
4. Locate your planter in the right place.
Like any garden bed, your planter will need enough sunlight for the plants you hope to grow. Most vegetables do best with 6-8 hours of full sunlight. Leafier crops like lettuces, arugula, kale, and Swiss chard, will tolerate slightly fewer hours or benefit from some dappled shade in the afternoon. To test the sunlight available in different spots on your patio or balcony, use a sunlight calculator or download one of the sunlight apps available through your cell phone.
Another thing to consider when locating your planter is proximity to water. If you aren’t installing irrigation, you’ll want to be close to your hose bib to avoid lugging water. This is equally true if you plan to use a soaker hose. Having your planter close to the kitchen can also be convenient when growing greens and herbs.
Elevated planter boxes are convenient to move from year to year.
5. Choose suitable plants.
What can you grow in a planter box? As noted above, there are some plants that don’t do well in planter boxes unless you have the soil depth required to help them thrive. The good news is that as more and more people turn to urban gardening, newer varieties of plant breeds designed for patio living have come onto the market. You can now find ‘patio’ or ‘compact’ varieties for most popular fruits and vegetables. Here are some of the best plants for planter boxes:
| Tomatoes: Tumbler, Tiny Tim, Red Robin, Manitoba | Peppers: Black Hungarian, Red Bulls Horn, Right on Red, Hungarian Hot Wax, Ancho |
| Squash: Shokichi Green Mini Kabocha, Raven or Bush Baby Zucchini | Cucumbers:Patio Snacker, Spacemaster, Tasty Green, Picolino |
| Sweet potatoes: Vineless Puerto Rico, Vardaman | Strawberries: Rose Berries Galore, Tribute, Fresca |
| Watermelon: Solitaire, Sugar Baby, Black Beauty Mini | Blueberries: Pink Icing, Peach Sorbet, Jelly Bean |
| Carrots: Little Fingers, Romeo, Paris Market | Raspberries: Raspberry Shortcake, Heritage |
Select varieties designed for patio plantings to get the most from your planter boxes.
You can also choose from the many vegetables that thrive in planter boxes less than 24” deep:
| Arugula Basil Broccoli Bush beans Cabbage Celery Chives Eggplant Garlic | Kale Leeks Lettuce Onions Peas Potatoes Radishes Rutabagas Spinach |
Planter box revolution
Wondering how to start a garden in a planter box? No matter how big your patio, backyard or balcony, there’s usually a planter box to fit your space. With the right soil, location, and plants, you can grow fresh fruit, vegetables and flowers almost anywhere.
