A 100cm-long rectangular planter is not a standardized product — dimensions, capacity, material, and weight vary significantly by brand, so verifying each spec against your planting plan matters more than the length alone.
Searching for large rectangular planters 100cm long usually means you have a specific linear space to fill — a patio border, balcony rail, or deck edge that needs about 40 inches of growing room. The catch is that “100cm” on a product page only tells you one side of the box. A plastic trough from one brand can hold 90 liters while a reinforced stone one from another holds 185 liters, and neither is wrong. The real skill is picking the right one for your plants, your climate, and your back.
What 100cm Actually Describes (And What It Doesn’t)
A rectangular planter listed as 100cm long is exactly that — one meter, or about 39.4 inches — from end to end. But width, depth, height, wall thickness, and overall shape are left to the manufacturer. Two planters that are both 100cm long can look completely different next to each other.
Here are the specs of current 100cm-long examples to show the real range:
| Planter | Material | Capacity | Dimensions (L×W×H) |
|---|---|---|---|
| Verve 98L Plastic Trough | Plastic | 98 L | 100 × 99.5 × 43 cm |
| Rowlinson Heritage Rectangular Planter | Softwood | 90 L | 100 × ~40 × ~23 cm |
| IDEALIST™ 100cm Trough Planter | Reinforced stone | ~185 L (per pair) | 100 × 36 × 51 cm |
| Zinc Matte Black 80cm Trough Planter | Zinc/aluzinc | Not listed | 100 × 100 × 80 cm |
Notice the Verve trough is a squat, wide container that is nearly as deep as it is long. The zinc planter is tall — 80cm high — and square at the base. The IDEALIST trough is deep but narrow. All are 100cm long; none will hold the same amount of soil or suit the same plant’s root system.
Choosing the Right Material for Your Situation
The biggest practical difference between 100cm planters is what they’re made of. Plastic options (like the Verve trough) are lightweight, affordable, and frost-resistant — but they can degrade in strong sun and may look less natural. Softwood planters (like the Rowlinson) offer a classic wood look but rot over time without a liner and treatment. Zinc and aluzinc planters (like the matte black trough) are rust- and frost-resistant, suitable for both indoor and outdoor use, but they weigh much more and can heat up in direct sun. Reinforced stone planters (IDEALIST) are heavy and premium-looking but are nearly impossible to move once placed.
If you plan to move the planter for seasonal rearranging, stick with plastic or lightweight polyester. If it goes in one spot permanently, reinforced stone or softwood lasts longer. Zinc falls in between — sturdy and attractive, but expect to set it and leave it.
Drainage, Capacity, and the Mistakes People Make
The two most common flubs with 100cm planters are assuming a standard capacity and forgetting about drainage. As the table shows, capacity ranges from 90 liters to nearly 200 liters for a pair. A shallow planter (around 23–25cm high) is fine for lettuce, herbs, and annuals. A deep one (51–80cm) is needed for tomatoes, shrubs, or perennials that send roots downward.
On drainage: some planters come with a hole and a removable plug — like the zinc trough planter — so you can keep the bottom sealed for indoor use or open it outdoors. Others may have no drainage at all, which means waterlogging and root rot are almost guaranteed unless you drill your own holes. Check the product page before you buy, not after it arrives. And do not assume all outdoor planters are frost-resistant; only specific materials — plastic, zinc, aluzinc, and reinforced stone — are explicitly rated for freezing winters. Softwood and uncoated metal can crack or decay.
If you are still deciding between models, our roundup of the best huge rectangular planters compares the top material options side by side so you can see which one fits your garden’s needs.
FAQs
Can a 100cm planter go directly on a balcony railing?
It depends on the planter’s width and your railing’s support capacity. A narrow, heavy stone trough (36cm wide, as with the IDEALIST) may not be stable on a railing mount; a lighter plastic trough of similar length is safer. Check the maximum weight load of your balcony rail before hanging anything.
How much soil does a 100cm planter need?
That depends entirely on the planter’s capacity, not its length. A 90-liter softwood planter needs about nine standard 10-liter bags of potting mix. A 185-liter reinforced stone trough would need eighteen bags. Always multiply the planter’s listed liters by 0.001 to convert to cubic meters, then match bag sizes.
Are 100cm planters heavy when filled with wet soil?
Yes, significantly. Wet soil weighs roughly 1.4 kilograms per liter. A 90-liter planter filled with damp potting mix can exceed 125 kilograms — that is the weight of a full-grown person. Place the planter where you want it permanently before adding soil, especially with stone or zinc models.
References & Sources
- The Home Depot. “Large Rectangular Planters & Pots” US product category showing size range and material types for large rectangular planters.
- DIY.com (B&Q). “100cm Long Zinc Matte Black 80cm Tall Trough Planter” Product page for zinc planter with drainage plug, weight, and indoor/outdoor use details.