Cheap Planter Boxes: What Lasts and What Rots in Two Years

Budget planters split into things that last a decade and things that fail fast. The materials, the drainage rule, and what the soil actually costs.

By Zakaria October 25, 2026 3 min read Save to Pinterest

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A rough timber planter box filled with soil and planted with pansies, photographed along its edge — Photo: Van3ssa_, Pixabay Content License, via Pixabay

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Budget planters split cleanly into two groups: things that last a decade and things that fail in two winters. The price tag does not tell you which is which — the material does.

The short answer

Fabric grow bags are the cheapest per litre at three to five seasons, and a galvanised steel stock trough is the cheapest route to a large, long-lived planter once you drill drainage holes. Cedar or larch gives eight to fifteen years with no treatment and is safe for edibles. Fibreglass and resin are the ones that survive a hard freeze, because they absorb no water. Avoid thin moulded plastic, which goes brittle in UV and cracks in its second season, and terracotta anywhere it freezes. Work out the soil cost before buying — it is usually the bigger number.

Fabric bags — cheapest per litre, by a lot
Galvanised trough — cheapest big planter. Drill the holes
Resin or fibreglass where it freezes. No water absorbed
Thin plastic is the false economy of the category
Price the soil first. It often costs more than the planter

The soil is the real cost

This is the number that catches people out, so do it before choosing anything.

Cubic feet = length × width × depth, in feet
A 2 ft cube is about 8 cubic feet
A 3 × 1 × 1 ft trough is 3 cubic feet
A standard 40–50 litre compost bag is roughly 1.5 cubic feet

So the 2 ft cube takes five or six bags. At bagged prices that is frequently more than the planter. Above about ten bags, bulk delivery is a fraction of the price.

Do not fill the bottom with rubble to save soil

The old advice to part-fill with crocks, polystyrene or bottles is still repeated and it causes the problem it claims to solve. It raises the saturated layer up into the root zone and reduces the soil volume that holds water between waterings.

Fill with soil, all the way. If the depth is more than the plant needs, choose a shallower planter rather than faking one.

Drainage, which kills more plants than frost

Several holes, not one, in the base
Raise the planter on feet or tiles so the base is not sealed against paving
No gravel layer. It does not improve drainage; it lifts the waterlogged zone
Check before buying — resin and galvanised planters often arrive with no holes drilled

Building instead of buying

For anything large, building is several times cheaper.

Rough-sawn softwood or decking board, butt-jointed and screwed. Square cuts are the only skill involved
Line the inside with pond liner, stapled, and punch drainage holes through the liner at the base. That one step roughly doubles the life of untreated softwood
Leave the base boards slightly apart for drainage, or drill them
Set it on feet. Timber in permanent contact with wet ground rots from there first
Do not treat the inside of anything growing food

Which one for which situation

Vegetables, smallest spend — fabric grow bags
Large planter, smallest spend — galvanised stock trough, holes drilled
Hard winters, stays outside — fibreglass or resin
Has to look right and last — cedar or larch
Mediterranean herbs, mild climate — terracotta
Balcony with a weight limit — plastic or fabric, and check the loading first

How we picked

Six budget planter types compared on lifespan, what they cost to fill, and how they behave through a freeze · Picks last checked October 2026.

Years before it fails: A $25 planter that splits in its second winter costs more per year than a $70 one that lasts fifteen. Replacement also means emptying and refilling it, which is the real work.
What it costs to fill: Soil is usually the larger number and nobody puts it on the box. A 2 ft cube takes about 8 cubic feet — often more than the planter itself at bagged prices.
Freeze behaviour: Terracotta and thin ceramic absorb water and split when it freezes. In a cold climate that single property decides most of the shortlist.
Drainage: The commonest killer of container plants is no drainage hole, or a hole sitting flat on a paving slab so it cannot drain at all.
Whether it is food-safe: Anything growing edibles should be inert. Untreated rot-resistant timber, galvanised steel and food-grade plastic are fine; unknown recycled plastics and older treated lumber are not worth the doubt.

Our picks

#	Pick	Best for	Where to buy
1	Fabric grow bags	Cheapest per litre	Check price for Fabric grow bags →
2	Cedar or larch trough, untreated	Best looking that lasts	Check price for Cedar or larch trough, untreated →
3	Fibreglass or resin planter	Best in a hard freeze	Check price for Fibreglass or resin planter →
4	Galvanised steel trough	Best large and cheap	Check price for Galvanised steel trough →
5	Terracotta	Best for looks in a mild climate	Check price for Terracotta →
6	Thin moulded plastic	Skip this one	Check price for Thin moulded plastic →

Cheapest per litre

Fabric grow bags

The best value in the category if appearance does not matter. For vegetables on a budget, nothing else comes close per litre.

Material: Non-woven polypropylene
Lifespan: 3–5 seasons
Sizes: 5–100 gal
Winter: Folds flat for storage

What we liked

Lowest cost per litre of growing space of anything here
Air-prunes roots, which prevents the spiralling that stunts potted plants
Weighs nothing empty and folds away at the end of the season
Drains freely with no drilling and no blocked holes

Worth knowing

Dries out fast in summer, often daily in heat
Looks utilitarian rather than decorative
Fabric degrades in strong sun after a few seasons

Check current price

Best looking that lasts

Cedar or larch trough, untreated

The one to buy if it has to look right and last. Set it on feet so the base is not sitting in water.

Material: Rot-resistant heartwood
Lifespan: 8–15 years
Treatment: None needed
Food safe: Yes

What we liked

Rot-resistant without any chemical treatment, so safe for edibles
Insulates roots, which matters in both heat and cold
Can be repaired a board at a time rather than replaced
Weathers to grey rather than failing

Worth knowing

Several times the price of softwood
Heavy once filled, so site it before filling
Still rots at any point in permanent ground contact

Check current price

Best in a hard freeze

Fibreglass or resin planter

The sensible choice anywhere winters are hard. Check it has a drilled drainage hole, and drill one if not.

Material: Fibreglass or polyresin
Lifespan: 10–20 years
Weight: Light for its size
Winter: Stays out, no splitting

What we liked

Absorbs no water, so nothing freezes and splits
Light enough to move when empty, unlike concrete or stone
Convincing stone and metal finishes at a fraction of the weight
Needs no sealing or maintenance

Worth knowing

Cheap ones fade and go chalky in strong sun
Thin-walled versions crack on impact
Often supplied with no drainage hole drilled

Check current price

Best large and cheap

Galvanised steel trough

The cheapest way to a big planter. Drill several drainage holes in the base before filling, and avoid a full-sun position in a hot summer climate.

Material: Galvanised steel
Lifespan: 15–20 years
Depth: Usually 12–24 in
Food safe: Yes

What we liked

Large volume for very little money, especially agricultural stock troughs
Will not rot, split or be eaten
Warms soil early, which is useful in a cool spring
Rigid enough to be moved when part full

Worth knowing

Conducts heat, so edge soil can cook in a hot climate
Rarely supplied with drainage holes
Dents, and the galvanising fails where it is scratched deeply

Check current price

Best for looks in a mild climate

Terracotta

Fine where it does not freeze, or where it can be emptied and brought in. In a cold climate it is a consumable, not a planter.

Material: Fired clay
Lifespan: Decades, if frost free
Breathability: High
Winter: Must come in where it freezes

What we liked

Porous walls let soil breathe, which suits Mediterranean herbs and succulents
Heavy enough not to blow over
Ages well and looks better with time
Widely available cheaply in small sizes

Worth knowing

Absorbs water and splits in a hard freeze
Dries out fast, so more watering
Heavy and breakable to move

Check current price

Skip this one

Thin moulded plastic

The false economy of the category. Replaced two or three times, it costs more than the resin planter that would have lasted fifteen years.

Material: Moulded polypropylene
Lifespan: 1–3 seasons outdoors
Cost: Lowest upfront
UV: Degrades quickly

What we liked

Costs the least of anything on the shelf
Light to carry and move
Usually comes with drainage holes

Worth knowing

Goes brittle in UV and cracks, often in the second season
Flexes when filled and bows out of shape
Thin walls give the roots no thermal protection at all

Check current price

Which should you buy?

If you…	Buy	Because
Cold winters, planter stays outside	Fibreglass or resin	Does not absorb water, so nothing to freeze and split. Terracotta in a hard frost is a crack waiting to happen.
Growing vegetables on a budget	Fabric grow bags	Cheapest per litre of soil by a wide margin, air-prunes roots, and folds away in winter.
Wants to look like timber and last	Cedar or larch, untreated	Naturally rot-resistant heartwood gives eight to fifteen years with no treatment and no chemicals near food.
Big planter, smallest possible spend	Build it from decking board	A 3 ft trough in rough-sawn softwood with a liner costs a fraction of the bought equivalent.
Balcony with a weight limit	Plastic or fabric	Soil is the weight. Avoid concrete and stone entirely, and check the balcony loading before filling anything large.

When not to buy at all

If the plant is going in the ground within a season, skip the planter — a nursery pot in a decorative sleeve costs nothing and the plant does not care. Permanent planters earn their money when there is no soil to plant into, or when the planting has to be moved.

Common questions

What is the cheapest planter box that lasts?

Per litre of growing space, fabric grow bags by a clear margin, at three to five seasons. For something that looks like a planter and lasts, a galvanised steel stock trough with drainage holes drilled is the cheapest route to a large, long-lived container. The cheapest thing that does not last is thin moulded plastic, which goes brittle in UV and usually cracks in its second season.

What should I avoid in a cheap planter?

Thin moulded plastic, terracotta in a freezing climate, anything with no drainage hole, and unknown treated or recycled timber if you are growing food. Also avoid buying before working out the soil cost — a large planter frequently costs less than the compost needed to fill it, and that surprise is what leads to the half-filled planter full of rubble.

How much soil does a planter box need?

Multiply length by width by depth in feet to get cubic feet. A 2 foot cube is about 8 cubic feet; a 3 by 1 by 1 foot trough is 3. Bagged compost is commonly sold in 40 to 50 litre bags, which is roughly 1.5 cubic feet, so that 2 foot cube takes five or six bags. Bulk delivery is far cheaper above about ten bags.

Do planter boxes need drainage holes?

Yes, without exception, and it is the commonest reason container plants die. Several holes rather than one, and the planter raised on feet or a couple of tiles so the base is not sealed flat against paving. Gravel in the bottom does not substitute for a hole — it raises the saturated zone rather than draining it.

Is it cheaper to build a planter box?

For anything large, yes, usually by a factor of several. A three-foot trough in rough-sawn softwood or decking board costs a fraction of the bought equivalent, and the only skills needed are cutting square and screwing. Line the inside with pond liner, punched for drainage, and untreated softwood will last eight to ten years instead of four.

Can I grow vegetables in cheap planters?

Yes, as long as the material is inert. Fabric bags, galvanised steel, food-grade plastic and untreated rot-resistant timber are all fine. Avoid older treated lumber and unknown recycled plastic. Depth matters more than material for the crop: six inches suits salad and herbs, twelve to eighteen is needed for carrots, parsnips and potatoes.

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Gear & Reviews · Sep 2, 2026

Cheap Planter Boxes: What Lasts and What Rots in Two Years

The soil is the real cost

Drainage, which kills more plants than frost

Building instead of buying

Which one for which situation

How we picked