Turn These 12 Household Castoffs Into Planters: Boot, Colander, Log, and Stock Tank Ideas With Drainage Specs and Plant Picks
Most guides skip the galvanized cadmium warning and pallet MB code. These 12 repurposed planter ideas include both — with drainage specs and USDA zone picks.
A store-bought planter that looks half-decent starts at $40. The colander shoved in the back of your cabinet, the rubber boot by the door, the wooden crate from last week’s wine delivery — those cost nothing and can look far more interesting than anything mass-produced. The difference between a repurposed container that thrives and one that kills its plants within six weeks comes down to one modification, applied correctly to each material type.
Below are 12 specific objects, each with the drainage prep it needs, a soil mix suited to its material properties, and plant recommendations matched to USDA zones 4–9. The galvanized cadmium warning and the pallet treatment code guide alone are worth the read — most sources skip both entirely.
The One Modification Every Repurposed Container Needs First
Every repurposed container must have at least one drainage hole before a single plant goes in. According to Illinois Extension, a hole at the bottom of the container is critical — it allows excess water to drain out and oxygen to reach the root zone. Without it, standing water displaces air from the soil, starving roots of oxygen and triggering root rot within days in warm weather.
One widespread mistake is adding a layer of gravel at the base to “improve drainage.” UC Master Gardeners of Santa Clara County explain the mechanism behind why this fails: water does not move easily from fine-textured potting soil into coarser gravel. Instead, it accumulates above the gravel layer — a phenomenon called a perched water table — making the waterlogged zone higher in the pot, not lower. The fix is to amend the potting mix itself with perlite, crushed lava, or pumice (roughly 20–25% by volume) rather than layering coarse material at the base.
For hole size: small holes (¼ inch minimum) let water escape while retaining most of the potting mix. If holes are larger and soil falls through, lay a single pottery shard or piece of mesh screen over the opening — nothing more. Double-potting (placing a draining liner inside a decorative outer pot) works well for glazed ceramics or any container where drilling risks cracking.
With that rule established, here are 12 objects worth a second look.
12 Repurposed Containers That Work as Planters
1. Kitchen Colander
A metal or plastic colander is probably the easiest conversion — drainage is already built in through every hole in the bowl. Line the interior with coco coir liner or a double layer of burlap before adding potting mix; this retains soil while still allowing free drainage through the base. Because airflow surrounds the root zone from all sides, colanders suit fast-draining plants: strawberries (zones 3–10), bush basil, or trailing nasturtiums. Hang the colander with three equally-spaced lengths of jute twine tied through the rim holes for a hanging basket that costs nothing. The main limitation is drying speed — colanders in full sun may need watering every day in summer.
2. Old Rubber Boot or Welly
Drill or punch three to five 3/8-inch holes through the sole of the boot — enough for drainage without weakening the structure. Rubber boots are non-porous, so they retain moisture longer than terracotta; use a standard soilless mix without extra perlite unless you’re planting drought-tolerant species. Shallow-rooted annuals work best given the narrow toe: pansies (zones 4–8 annual), compact marigolds, or a single succulent in the toe with trailing sedum spilling over the shaft. Group three mismatched boots of different heights on a front step for a display that read as intentional rather than accidental.
3. Galvanized Stock Tank or Livestock Trough
A 100-gallon galvanized stock tank makes a dramatic large-scale planter, but one safety rule applies without exception: use it for ornamental plants only. University of Washington’s horticultural library notes that cadmium — a toxic heavy metal — is a known contaminant of many zinc-based galvanizing compounds and can leach into soil over time, particularly in the presence of acidic potting mixes. Growing herbs or vegetables in galvanized containers carries a contamination risk; untreated wood or clay is the safer choice for edibles.
For ornamentals, drill 8–10 half-inch holes across the base using a step drill bit, then set the tank on pot feet or bricks for airflow. Metal absorbs heat rapidly in summer — in zones 7–9, the root zone of a south-facing tank can exceed 90°F by afternoon, which stunts root growth. Position on the north or east side of a structure, or shade the tank walls with stacked stone. Fill with ornamental grasses (Miscanthus sinensis ‘Gracillimus,’ zones 5–9), tall dahlias (zones 8–11 or lift in zones 4–7), or a mixed perennial planting. See our guide to tall planter ideas for plant height combinations that suit this scale.
4. Vintage Teapot or Kettle
A teapot with a spout often drains adequately through the spout hole alone, but check by watering lightly and watching for runoff before trusting it fully. If the spout is sealed or the pot holds water, drill one 3/8-inch hole in the base. Because teapots are small (typically 1–2 quarts), they suit plants that tolerate drying between waterings. Fill with a gritty succulent mix (60% standard soilless, 40% coarse perlite or horticultural grit) and plant a single Echeveria, a compact Haworthia, or one stem of Sedum ‘Angelina.’ These require watering only when the mix is fully dry — roughly weekly in summer, once a month in winter. A vintage teapot cluster on a shaded porch shelf makes an effective year-round display for indoor/outdoor succulents.
5. Wooden Wine Crate or Fruit Box
The RHS specifically endorses wine boxes and wooden crates as inexpensive, sustainable container options. Before planting, line the interior with a compost bag or heavy-duty plastic sheeting, then pierce the lining every 4–5 inches across the base for drainage. This liner protects the wood from constant moisture contact, significantly extending the crate’s lifespan from one season to three or four. Use a standard multi-purpose peat-free potting mix — no amendment needed since the liner and drainage holes do the work.
Wine crates suit a classic thriller-filler-spiller combination: one upright Salvia ‘Amistad’ (zones 8–10, or annual elsewhere) as thriller, compact zinnias as filler, and Dichondra ‘Silver Falls’ trailing over the edge as spiller. The natural wood grain reads well alongside other container types on a patio. Consider a coat of exterior wood preservative on the outside faces before assembling if you want the crate to last more than two seasons outdoors.
6. Old Belfast or Butler’s Sink
The RHS cites Belfast sinks as one of the most effective repurposed containers in a British kitchen garden tradition, and the principle translates to US gardens too. A ceramic sink is heavy enough (50–100 lbs empty) that you place it once and leave it permanently. The existing drain hole provides drainage; raise the sink 2–3 inches on brick feet so the drain hole isn’t obstructed and water flows freely. Fill with a gritty alpine mix: one part standard potting mix, one part coarse horticultural grit, one part perlite. This drains fast enough for Mediterranean and alpine species that struggle in richer soils. Plant with creeping thyme (zones 4–9), Sempervivum varieties (zones 3–8), or low Erigeron — all are long-lived, drought-tolerant, and proportion well to the sink’s wide, shallow profile. Learn more about choosing the right soil ratios in our guide to container potting mixes.
7. Wooden Pallet (HT Code Only)
Before touching any pallet, check the IPPC treatment stamp. You need HT (heat-treated) or KD (kiln-dried). Reject any pallet stamped MB — methyl bromide, a fumigant toxic to the nervous system, and one that persists in wood. UC ANR’s backyard gardener program is explicit: MB pallets should never be used in gardening. Older pallets may also carry CCA (chromated copper arsenate, which contains arsenic) — these are equally unsuitable. University of Washington’s horticultural library notes that even with HT pallets, tracing treatment history for food crops is difficult enough that ornamental use is the safer default.
For an HT pallet, stand it upright and staple landscape fabric to the back and sides to form planting pockets. Fill each pocket with soilless mix and plant trailing herbs (thyme, oregano), compact sedums, or strawberries spaced 6 inches apart. Water from the top slowly — the pockets at the bottom fill first, so top pockets may dry out faster. A vertical pallet planter on a fence takes up zero floor space and works in zones 4–9 as a seasonal feature.
8. Tin Watering Can
A watering can with a rusted-out base or a cracked body still makes a functional planter. Drill four to five 3/8-inch holes in the base if they don’t already exist, then fill with standard soilless mix. The spout handle acts as a natural visual pointer, making a watering can planter work particularly well at the corner of a step or at the edge of a path where it guides the eye. Compact, lightweight annuals suit the proportions: a single ‘Lemon Drop’ marigold (zones 2–11 annual), trailing lobelia, or a cluster of dwarf dahlias (zones 8–11, or lift for zones 4–7). The worn metal aesthetic pairs naturally with other rustic materials — stack two or three mismatched cans at different heights for a front-step vignette. This is one of the lowest-investment entries on this list.
9. Old Garden Wheelbarrow
A wheelbarrow with a rusted or punctured tray becomes a highly functional planter with minimal work. Drill six to eight half-inch holes across the base, then fill with a 50:50 blend of soilless mix and compost — the depth and volume (typically 3–5 cubic feet) support larger, longer-lived plantings than most small repurposed containers. The wheel makes the whole planter mobile, which is genuinely useful in zones 4–6 where tender plants benefit from being moved under cover before the first frost.
The best plantings for a wheelbarrow use the full depth: one upright ornamental grass or Canna (zone 8–11, or lift) as a centrepiece, surrounded by medium-height annuals, with a trailing Calibrachoa or sweet potato vine (zones 9–11, or annual) falling over the sides. Avoid planting directly into a galvanized tray for the same cadmium reasons noted in idea 3 — paint the interior with a non-toxic exterior paint before use, or plant in a removable liner. See our guide on container gardening mistakes for other common oversights when planting large mixed containers.
10. Hollowed Log
A section of a fallen tree trunk, hollowed out with a chisel or a long auger bit, creates the most naturalistic planter on this list. Soft woods like pine hollow in 20–30 minutes; hardwoods take longer but last a decade outdoors. No drainage holes are strictly necessary if the bottom is open or the wood is porous enough — water wicks through decaying wood walls. If the base is solid, drill three to four 3/4-inch holes through the base. Line the hollow with a loose layer of sphagnum moss before adding potting mix; this keeps soil in while the moss naturally regulates moisture.
Because hollowed logs sit low and read as woodland objects, they suit shade-loving plants best: hosta (zones 3–9) in any foliage colour, Astilbe (zones 3–9), fern, or a single Ajuga ‘Chocolate Chip’ (zones 3–9) for groundcover-style spill. Over two to three seasons, the log will begin composting itself, enriching the planting mix from below — I’ve seen pine sections last nine years before the walls gave way, while hardwood oak logs easily exceed fifteen. This is an excellent project for a shaded corner where manufactured planters look out of place. For more shade container options, browse our succulent planter ideas for sun-loving contrast plantings nearby.
11. Terracotta Chimney Pot or Flue Liner
Salvaged chimney pots — the tall, cylindrical terracotta sections that cap household chimneys — are excellent repurposed planters because they already exhibit the properties you’d engineer into a container: unglazed terracotta walls that breathe moisture away from roots, narrow profiles that prevent waterlogging, and substantial thermal mass that buffers temperature swings. Most have an open base; if yours is partially sealed, remove any mortar and open the base to at least 2–3 inches in diameter. Fill with a John Innes No. 3-equivalent mix (or 2 parts garden soil: 1 part compost: 1 part grit/perlite) suitable for the long-term, perennial plantings that suit a permanent chimney pot.
Mediterranean herbs thrive in this container: lavender (zones 5–9, Hidcote or Munstead for zones 5–6, Phenomenal for zones 4–8), rosemary (zones 7–11 or annual in zones 4–6), and trailing oregano spilling over the rim. The height of the pot — typically 16–24 inches — places the planting at a natural eye level when set on a path edge or either side of a doorway. Chimney pots are durable in USDA zones 3–9 as long as the planting doesn’t stay waterlogged through freeze-thaw cycles. Check out our detailed planter ideas growing guide for hub-level advice on pairing chimney pots with other container types.
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→ Find the Right Pot12. Fence-Mounted Rain Gutter Section
A 4-foot section of half-round PVC rain gutter, capped at both ends, turns a blank fence into a planting surface without removing any floor space. Drill a 3/8-inch hole every 6 inches along the lowest point of the gutter — the curved base — before mounting. PVC is non-reactive, UV-stable, and unaffected by freeze-thaw in most US zones. Mount the gutter at a very slight angle (1/4 inch drop per foot of run) so water drains toward the lower end cap rather than pooling at the centre. Use a soilless mix amended with extra perlite (1:4 ratio) because gutter depth is shallow — typically 3–4 inches — and shallow containers dry faster than deep ones.
Shallow roots do best: Sedum ‘Dragon’s Blood’ (zones 3–9), compact herbs (thyme, chives), or trailing Dichondra ‘Emerald Falls.’ Run two or three gutters at different heights on the same fence panel for a living wall effect. For a full overview of how to combine different planter types and styles in a single outdoor space, our container gardening guide covers layout and proportion principles. And for those who want to go further with personalising the look, our planter painting ideas article covers material-specific paint and primer combinations for outdoor use.
Frequently Asked Questions
Can I use any container as a planter as long as I add drainage holes?
Almost — with two exceptions. Galvanized metal containers (like stock tanks) can leach cadmium into soil, making them unsafe for herbs and vegetables; use them for ornamentals only. Wooden pallets stamped MB (methyl bromide) should never be used in gardening at all. For everything else, adding drainage holes and using a well-amended soilless mix is the main requirement.
How many drainage holes does a repurposed container need?
One hole per 6 inches of base area is a workable rule. A colander already exceeds this. A large stock tank needs 8–10 holes. A single boot needs 3–5 in the sole. The critical requirement from Illinois Extension: at least one hole, positioned at the lowest point of the base, is non-negotiable for root health.
Should I add gravel to the bottom of repurposed containers?
No. UC Master Gardeners of Santa Clara County explain that gravel creates a perched water table — water accumulates above the gravel rather than draining through it, reducing the usable, well-drained soil depth. Amend the potting mix with perlite (20–25% by volume) instead.
Sources
- Growing plants in containers: Expert Guide — Royal Horticultural Society
- Drainage in Containers — UC Master Gardeners of Santa Clara County, UC ANR
- Growing Edible Plants in Galvanized Containers — Elisabeth C. Miller Horticultural Library, University of Washington
- Safety of Wooden Pallets for Vegetable Gardens — Elisabeth C. Miller Horticultural Library, University of Washington
- Picking Pallets for Raised Beds — UC ANR Backyard Gardener
- Growing Media (Potting Soil) for Containers — University of Maryland Extension
