Best Flower Boxes for Balcony: 10 Railing Planters Compared

One long box or several short ones? That choice shapes a balcony more than color does. The EINYEXW 30 Inch Railing Planter runs 30 inches in a single pair, while the YAHKBTEN 6 Pack Railing Planter Boxes gives you six boxes of 16.9 inches each. The Veradek Pure Series Railing Planter is a 36 inch single box.

The rail itself sets the next limit. The VOXOR 24 Inch Half Round Planter lists brackets for rails up to 6.5 inches wide, while the Sunexinlo 4 Pack Railing Planters lists 1.6 to 3.7 inches. Measure the top of your rail before you pick a bracket style.

We compared 10 railing planters by material, length, pack size and listed rail width, using only listing details. Some listings leave out rail width or depth, and we say so where that happens.

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On this page

1. Compare Balcony Flower Boxes by Material, Length, Pack Size and Rail Width
2. Detailed Reviews: Best Flower Boxes for Balcony
3. Do Not Buy Before You Measure the Rail
4. Check the Weight and the Building Rules
5. How to Choose Flower Boxes for a Balcony
6. Which Balcony Flower Box Should You Choose?
7. Frequently Asked Questions
8. Final Verdict

Compare Balcony Flower Boxes by Material, Length, Pack Size and Rail Width

Detailed Reviews: Best Flower Boxes for Balcony

1. VOXOR 24 Inch Half Round Railing Planter 2 Pack (Best overall balcony flower box)

• 24 inLength
• 6.1 inDepth
• 6.5 inMax rail width
• 2Pack

Best for: wide balcony rails and deeper planting

Why it ranks #1: It lists the widest rail range here plus a clear depth and a coco liner.

VOXOR lists a half round window box with a powder coated metal frame and adjustable brackets that fit rails and fences up to 6.5 inches wide. The curved shape is said to maximize planting space.

The listing gives a 6.1 inch depth for more soil volume and says the frame helps reduce tipping. A coco liner is included, which the listing says you use as the planting layer.

Skip it if you have a very narrow rail or want a longer box; the EINYEXW 30 Inch Railing Planter is 30 inches.

2. EINYEXW 30 Inch Railing Planter Box 2 Pack (Best long flower box for balcony rails)

• 30 inLength
• 2 to 6.3 inRail width
• 2Pack
• CocoLiner

Best for: a long continuous row of flowers

Why it ranks #2: It is the longest pair listed and gives a clear two-ended rail width range.

EINYEXW lists a carbon steel railing planter with a weatherproof finish and pre-installed natural coco liners. The listing says the liners help drainage and breathability.

The adjustable brackets are listed for deck rails, porch rails, fences and window mounts from 2 to 6.3 inches wide. At 30 inches each, two boxes cover a long stretch of railing.

Skip it if your rail is short or thin; the YAHKBTEN 6 Pack Railing Planter Boxes has smaller boxes.

3. YAHKBTEN 6 Pack Deck Railing Planter Boxes (Best 6 pack of railing planter boxes)

• 6Pack
• 16.9 x 6.9 x 5.5 inEach box
• 1.6 to 4.9 inRail width
• 12Brackets

Best for: a long balcony with many small boxes

Why it ranks #3: It lists six boxes with trays and 12 brackets in one set.

YAHKBTEN lists six boxes of 16.9 x 6.9 x 5.5 inches each, with 12 adjustable metal brackets that clamp onto rails by hand tightening and need no drilling into the rail.

Each box has multiple drainage holes and a snap-on removable tray. The listing says the brackets detach, so the boxes can also sit on a windowsill or the floor.

Skip it if you want a metal frame; the VOXOR 24 Inch Half Round Planter is metal.

4. Sunexinlo 4 Pack Gray Railing Planter Boxes (Best gray plastic railing planters)

• 19.7 x 7.8 x 5.7 inEach box
• 4Pack
• 1.6 to 3.7 inRail width
• 2 setsBrackets

Best for: slim rails and a neutral color

Why it ranks #4: It lists a longer box than most plastic sets and a clear tray design.

Sunexinlo lists four rectangular boxes of 19.7 x 7.8 x 5.7 inches in PP plastic, with two sets of double-sided adjustable brackets and locking screws. The listing says no drilling is needed.

Each box has drainage holes and a detachable water tray. The listing calls them lightweight and says the metal brackets resist rust.

Skip it if your rail is wider than 3.7 inches; the YAHKBTEN 6 Pack Railing Planter Boxes and VOXOR 24 Inch Half Round Planter fit wider rails.

5. Veradek Pure Series Tapered Railing Planter 36 Inch (Best single large tapered railing planter)

• 36 inLength
• 10 inWidth
• 9 inHeight
• 9 lbWeight

Best for: one statement box with a modern look

Why it ranks #5: It lists full dimensions, weight and a temperature range.

Veradek lists a tapered window box in high-grade plastic that resists cracks, scratches, UV and fading. The listing gives 9 inches in height, 10 inches in width and 36 inches in length.

It comes fully assembled with an adjustable metal railing bracket, and the listing says it can also go on a window sill, fence or wall. Each box weighs 9 lb before soil.

Skip it if you want a pack of small boxes; the YAHKBTEN 6 Pack Railing Planter Boxes has six.

6. Karlliu 24 Inch Window Boxes Planters 2 Pack Black (Best black metal window box pair)

• 24 inLength
• 2Pack
• Carbon steelFrame
• CocoLiner

Best for: a classic black metal look

Why it ranks #6: It lists a rust-resistant coating and coco liners in a simple pair.

Karlliu lists a carbon steel planter with a rust-resistant powder coating and coconut coir liners. The listing says the reinforced hardware prevents soil leakage.

It lists tool-free assembly and brackets you adjust to hang the box. The listing mentions railings, fences, walls and window sills as places to hang it.

Skip it if you want a wider rail range; the VOXOR 24 Inch Half Round Planter lists up to 6.5 inches.

7. CADUKE 6 Pack 17 Inch Deck Railing Planter Boxes Green (Best green plastic railing planter set)

• 6Pack
• 16.9 x 6.9 x 5.5 inEach box
• 1.6 to 4.9 inRail width
• TrayWater catch

Best for: a green set on a mid-width rail

Why it ranks #7: It lists two install options and a tray in a six box set.

CADUKE lists six green plastic boxes of 16.9 x 6.9 x 5.5 inches with adjustable metal supports. The bracket offers two installation options for rails from 1.6 to 4.9 inches wide.

The bottom ventilation holes are listed for air and water flow, and the tray collects extra water. The listing suggests flowers, herbs and small vegetables.

Skip it if you want a metal frame; the Karlliu 24 Inch Window Boxes is carbon steel.

8. Karlliu 4 Pack 14 Inch Half Round Wall Mounted Window Boxes (Best wall mountable half round boxes)

• 14 inLength
• 4Pack
• 8Zip ties
• CocoLiner

Best for: walls and fences as well as rails

Why it ranks #8: It lists wall hardware and zip ties in the box.

Karlliu lists four half round planters on a carbon steel frame with a rust-resistant powder coating and coco coir liners.

The listing says they can be wall mounted on flat surfaces and come with 8 zip ties and wall anchor screws. It also says they suit window boxes, railings and fences.

Skip it if you want a longer box; the EINYEXW 30 Inch Railing Planter is 30 inches.

9. Dahey 15 Inch Railing Planter Box 3 Pcs Metal Black (Best hook style metal planters)

• 15 inLength
• 3Pack
• 2.7 inHook width
• BlackColor

Best for: thin rails and fence tops

Why it ranks #9: It lists a clear hook width and drainage holes.

Dahey lists a rectangular metal hanging box with detachable hooks of 2.7 inches wide and drainage holes. It lists balconies, windows, yards and gardens as places to hang it.

The listing suggests flowers, herbs, peppers, strawberries and tomatoes. The hook width means it fits only rails thin enough for that hook.

Skip it if your rail is wide; the VOXOR 24 Inch Half Round Planter and EINYEXW 30 Inch Railing Planter list wider ranges.

10. OBTANIM 4 Pack Metal Hanging Flower Pots Iron Railing Planter (Best small iron hanging planters)

• 10.5 x 5.5 inTop
• 4.9 inHeight
• 4Pack
• BlackColor

Best for: succulents and small herbs

Why it ranks #10: It lists exact dimensions and drain holes for a small set.

OBTANIM lists a metal iron hanging planter with drainage holes and detachable hooks. The top measures 10.5 x 5.5 inches and the height is 4.9 inches.

The listing says the hooks are not assembled inside the packaging, so you need to attach them. It suggests succulents, cacti, flowers and vegetables.

Skip it if you want larger flowers; the VOXOR 24 Inch Half Round Planter or EINYEXW 30 Inch Railing Planter holds more soil.

Do Not Buy Before You Measure the Rail

Bracket range is the first thing to check. The VOXOR 24 Inch Half Round Planter lists up to 6.5 inches, the EINYEXW 30 Inch Railing Planter lists 2 to 6.3 inches, the YAHKBTEN 6 Pack Railing Planter Boxes lists 1.6 to 4.9 inches and the Sunexinlo 4 Pack Railing Planters lists 1.6 to 3.7 inches. If your rail top is wider than the range, the box will not sit right.

Round, flat and square rails also differ. Check the listing photos and the bracket shape, and look at how the rail is built before you hang any soil-filled box on it.

Check the Weight and the Building Rules

Wet soil adds a lot of weight on a rail. A long box holds more soil than a short one, so a 30 or 36 inch box asks more of the rail than a 14 inch one. The Veradek Pure Series Railing Planter lists 9 lb before soil and water.

Many buildings have rules about what can hang over a balcony edge, so check your lease or association rules first. For layout ideas, see our guides to railing planter setups for a narrow balcony and balcony garden ideas for renters.

How to Choose Flower Boxes for a Balcony

Material

The YAHKBTEN 6 Pack Railing Planter Boxes, Sunexinlo 4 Pack Railing Planters, Veradek Pure Series Railing Planter and CADUKE 6 Pack Railing Planters are plastic. The VOXOR 24 Inch Half Round Planter, EINYEXW 30 Inch Railing Planter, Karlliu 24 Inch Window Boxes, Karlliu 14 Inch Half Round Planters, Dahey 15 Inch Hanging Planter Box and OBTANIM 4 Pack Iron Railing Planters use metal. Metal boxes like the VOXOR 24 Inch Half Round Planter, EINYEXW 30 Inch Railing Planter, Karlliu 24 Inch Window Boxes and Karlliu 14 Inch Half Round Planters list coco liners.

Length and pack

For a long run, the EINYEXW 30 Inch Railing Planter is 30 inches and the Veradek Pure Series Railing Planter is 36 inches. For many small boxes, the YAHKBTEN 6 Pack Railing Planter Boxes and CADUKE 6 Pack Railing Planters come in sixes and the Karlliu 14 Inch Half Round Planters comes in fours.

Rail width

Use the lists above and measure your rail first. The Dahey 15 Inch Hanging Planter Box uses hooks of 2.7 inches wide, so it suits thin rails only.

Drainage

The YAHKBTEN 6 Pack Railing Planter Boxes, Sunexinlo 4 Pack Railing Planters and CADUKE 6 Pack Railing Planters list trays, while the Dahey 15 Inch Hanging Planter Box and OBTANIM 4 Pack Iron Railing Planters list drain holes. Coco liners drain on their own, so check how water will reach the floor below.

Which Balcony Flower Box Should You Choose?

• If you want the best all-round box, choose the VOXOR 24 Inch Half Round Planter, because it lists the widest rail range and a 6.1 inch depth.
• If you want a long row, choose the EINYEXW 30 Inch Railing Planter, because each box is 30 inches.
• If you want many small boxes, choose the YAHKBTEN 6 Pack Railing Planter Boxes, because it comes as six with 12 brackets.
• If you have a slim rail, choose the Sunexinlo 4 Pack Railing Planters, because it lists 19.7 inch boxes for rails up to 3.7 inches.
• If you want one big statement box, choose the Veradek Pure Series Railing Planter, because it is 36 inches long and arrives assembled.
• If you like black metal, choose the Karlliu 24 Inch Window Boxes, because it lists a powder coated carbon steel frame.
• If you want a green set, choose the CADUKE 6 Pack Railing Planters, because it comes as six with trays.
• If you want to mount on a wall, choose the Karlliu 14 Inch Half Round Planters, because it lists anchor screws and zip ties.
• If your rail is thin, choose the Dahey 15 Inch Hanging Planter Box, because it lists 2.7 inch hooks.
• If you grow succulents, choose the OBTANIM 4 Pack Iron Railing Planters, because the small boxes suit shallow roots.

Frequently Asked Questions

What are the best flower boxes for a balcony?

For most balconies, the VOXOR 24 Inch Half Round Planter is the best pick here because it lists a 6.1 inch depth and brackets for rails up to 6.5 inches. For a long row, the EINYEXW 30 Inch Railing Planter is 30 inches.

How do I know if a flower box fits my balcony rail?

Measure the width of the top of your rail and compare it with the listed bracket range. The YAHKBTEN 6 Pack Railing Planter Boxes lists 1.6 to 4.9 inches and the Sunexinlo 4 Pack Railing Planters lists 1.6 to 3.7 inches.

Are plastic or metal railing planters better?

Plastic boxes like the YAHKBTEN 6 Pack Railing Planter Boxes are lightweight and list trays. Metal boxes like the VOXOR 24 Inch Half Round Planter have a frame and a coco liner. Pick by weight, look and drainage.

Can I put flower boxes on a balcony rail without drilling?

Several listings, such as the YAHKBTEN 6 Pack Railing Planter Boxes and Sunexinlo 4 Pack Railing Planters, say the brackets clamp on with no drilling. Check your building rules and the weight of wet soil first.

Which flower box suits a wall instead of a rail?

The Karlliu 14 Inch Half Round Planters lists wall anchor screws and zip ties, so it can go on a flat surface. Check that the wall can take the weight.

What plants suit small hanging planters?

Small boxes like the OBTANIM 4 Pack Iron Railing Planters suit succulents and small herbs because the soil volume is small. Deeper boxes like the VOXOR 24 Inch Half Round Planter hold larger flowers.

Final Verdict

The VOXOR 24 Inch Half Round Planter is the best flower box for a balcony in this guide. It is a 24 inch half round metal pair with a 6.1 inch depth, a coco liner and brackets for rails up to 6.5 inches. If you want a long row, the EINYEXW 30 Inch Railing Planter is 30 inches. Before you buy, measure your rail and check your building rules on weight.

See the VOXOR 24 Inch Half Round Planter on Amazon