Plan your outdoor project
Planters & Raised Beds Buying Guide
The first decision is where the soil will sit. An open-bottom raised bed rests over the ground, a planter contains its growing medium, and an elevated planter also has to support that material above ground. Similar-looking products can belong to any of these groups, so establish the construction before comparing dimensions or price.
| Type | Useful when | Check before buying |
|---|---|---|
| Open-bottom raised bed | You want a defined growing area over suitable ground | Access from the sides, internal growing depth and the condition of the ground beneath |
| Planter with a base | You need a contained planting space on a suitable surface | Drainage, usable internal dimensions and the plant’s root space |
| Elevated planter | You want the growing area raised to a convenient working height | Stated load limit, stability, drainage and working height |
| Decorative outer pot | You want to conceal a separate growing pot | Fit of the inner pot and a way to prevent collected water from standing around it |
Separate the outside footprint from the growing space
Outside measurements help you decide whether a container fits beside a door or along a path. Inside measurements determine how much room remains for growing medium. Wall thickness, tapered sides and a raised base can make those two sets of dimensions quite different.
For example, the Anderson Teak rectangular planter listing gives an outside footprint of 36 by 18 inches. That is useful for planning its position, but the listing does not establish internal soil capacity or confirm drainage details. Resolve those points before choosing it for a particular plant. Multiplying its outside dimensions would give a misleading fill estimate.
Calculate volume from the internal dimensions
For a rectangular bed with internal dimensions of 4 feet by 8 feet and a 1-foot fill depth, the empty volume is 32 cubic feet. Divide by 27 to convert that to about 1.19 cubic yards. This is a geometry example, not a fixed soil order: taper, material already in the bed, any designed void and settling change the amount you need.
Keep the units consistent. If measurements are in inches, divide each by 12 before multiplying to obtain cubic feet. Do not confuse square feet of floor area with cubic feet of growing medium. For a container on a balcony or deck, its size alone does not establish that the supporting surface can carry the filled load; confirm the relevant load limits before buying.
Make planting and watering reachable
University of Minnesota Extension’s raised-bed guidance emphasizes access and a width you can reach without standing in the bed. A bed accessible from only one side may need a different width from one with paths along both sides. Plan the path and water access at the same time as the bed.
For containers, RHS guidance stresses drainage and adequate root space. Check that the chosen planting arrangement lets excess water escape, including when an inner pot sits inside a decorative outer container. A label such as “outdoor planter” is not a substitute for an actual drainage detail.
Compare planters once you know the outside space and required internal growing room. Choose among raised beds after checking the base design, reach and fill depth. For several containers or beds, the watering and irrigation guide can help you plan a compatible watering layout.
Reviewed October 1, 2026 by Eco Sweet Home. Based on manufacturer specifications and the sources linked above; no hands-on product testing is claimed. Confirm the selected model, pack quantity and included parts on the product page. For an unresolved specification, contact us before ordering.
