Best Window Box Planters of 2026

Eight boxes in one order is how you dress a whole run of windows without hunting for matches. We like the Hananojia set for exactly that: identical 17-inch boxes with identical saucers, so a long sill or a row of hooks reads as one line of planting instead of a collection of pots. At 7 inches wide and 6.3 inches deep there is enough soil for annuals and herbs to put down real roots.

The saucer earns its keep. It clips onto the base and stays clipped, which matters when the box is up on a sill and you are watering from a can you can barely reach. Two drainage holes feed it, the plastic is glossy rather than chalky, and it has the stiffness to be lifted full without bowing in the middle.

Line them up and you get seams — eight boxes are eight boxes, and no arrangement hides the joints. If a single unbroken box is the look you want, buy length instead. What this set buys you is flexibility: lift one out to replant, swap a spent box for a fresh one, or split the set between a kitchen sill and a porch rail.

Pick one up and the wall thickness is the first thing you notice — heavy, solid polypropylene that reads as ceramic from a step away, which is rare at this size. The pair measures 12 inches by 4.5, small enough for the sill above a kitchen sink, and it is the set we reach for when the sill is a display rather than a farm.

What sells it past the finish is the mesh disc that sits over the drainage holes. Soil stays in the pot instead of washing into the saucer, roots do not clog the drains, and the trays line up and detach without a fight. Both pots are BPA- and lead-free, which matters if you are growing thyme and basil you intend to eat. The trade-off is scale: about three-quarters of a gallon of soil each means herbs, succulents, or a couple of small houseplants rather than a geranium display.

This is a liner, and that is the whole point. If you have a wooden window box gone soft at the joints, or a metal railing planter rusting through the base, the Poly-Pro drops inside and gives you a clean growing container — 29.75 inches long, 8 wide, 5 deep — without rebuilding anything.

On its own it is a plain ridged trough that weighs next to nothing, and that lightness is the useful part: a 30-inch box one person can lift out, tip the old soil into a barrow and set back. It is made in the USA from recyclable, fade-resistant plastic, and 2.3 gallons is plenty for a row of annuals or a strawberry run.

We keep it on the list because nothing else here solves the liner problem, not because it is the prettiest box in the group. Drainage is the thing to check: the holes are not always opened at the factory, so look at the base and drill them if you need them — five minutes with a standard bit, and it is also the reason this one can sit indoors without marking a sill.

Taupe, with shading that shifts across the face, this is the box that gets asked about. The PSW is a composite of recycled plastic, stone powder and wood dust, and from the sidewalk it passes for cast stone — better than any of the resin boxes here manage.

It ships with no drainage holes, and that is deliberate: the material drills cleanly with a standard bit without splitting, so you decide whether it is a planter, a liner for something larger, or a tabletop trough on a covered porch. For a console indoors or a sheltered entry it is genuinely convenient — nothing drips until you ask it to.

At 17.65 inches long, 6.3 deep and 6.3 tall, and light enough to move with one hand, it sits rather than hangs. It costs more than a plain plastic box of the same length, which is the trade you make for a finish that does not look like a bucket.

This is the one we point to when the box is going somewhere visible and nobody will be hauling it in and out. As a working window box on an exposed wall, the Mayne is the better tool; as something that has to look like stone on a porch, nothing else in this group comes close.

Come October, the difference between a good window box and an irritating one is how easily you can empty it. The Dura Cotta holds three gallons — enough soil for a real row of annuals or a kitchen's worth of herbs — and at about a pound and a half empty it comes off the ledge in one pair of hands.

The base is the clever part and the thing to understand before buying. Bloem molds knockout plugs into it: leave them sealed and the box holds water without leaking, which makes it workable on an indoor kitchen sill with the included saucer underneath; knock them out with a screwdriver and it drains like any outdoor box. You choose once, at planting time.

The resin is UV-protected, so it will not fade or need repainting, and 24 inches is a sweet spot for one window — long enough to read as a built-in box rather than an oversized pot, shallow enough at 7.5 inches that it does not crowd the glass.

We recommend it to anyone who wants one box instead of a set, and especially to renters and indoor growers who need the sealed version. Set against the double-walled Mayne, this is the lighter-duty box; it is happiest sitting on a ledge with its saucer under it rather than carrying a wall full of wet soil.

Eight and a half inches long is smaller than most people picture, and the photos do not help — these are herb pots, not window boxes in the traditional sense. What they are is the right size for the sill above a kitchen sink, five at once, in a clean white ABS that looks more expensive than it is.

They are made for a row of basil, mint or cat grass in a window where a 17-inch box would block the light, and the details suit that job: drainage holes in the base, a drip tray under each one, and trays that lift out for rinsing. We have had good results bottom-watering in them — the trays hold a real soak and the soil pulls it up — and the plastic has not gone brittle on a hot sill. Two limits: 1.7 liters is small-plant territory, and white is the only finish.

Sills are narrower than anyone expects — plenty are barely four inches deep, which rules out most of the boxes on this page. The GREANER is 16 inches long and under five wide, and it is the one we suggest to anyone who has measured their ledge and come back with a number that sounds too small.

It is a single box, not a set: one planter, one removable saucer, three drainage holes open and three left closed for you to punch out when a plant wants freer drainage. That control is genuinely useful — herbs in a bright window want to dry out, a succulent on a desk does not. The white ABS is glossy and stiff, and the saucer slides out for emptying without dragging soil with it.

Where it runs out of ambition is size. Just under four inches of depth and a four-inch width will grow herbs, lettuce, succulents and small trailers; it will not grow the cascading petunias people picture when they hear window box. We like it as the answer to a measurement problem, not as a general-purpose box — and at this size, order two.