The Complete Guide to Planters, Pots and Container Gardening

Why Container Gardening Works for Everyone

You do not need a garden to garden. A balcony, a patio, a doorstep, a flat roof, a windowsill — any surface that gets light can support plants in containers. Herbs on a kitchen windowsill, tomatoes in pots on a south-facing terrace, a fruit tree in a large planter by the front door, a wildflower display in a window box — all of these are container gardens.

Container gardening also solves problems that gardening in the ground cannot. If your soil is poor, contaminated, waterlogged, or full of tree roots, containers bypass it entirely. If you rent and cannot modify the garden, containers move with you. If you have physical limitations that make ground-level gardening difficult, raised planters bring the garden to a comfortable working height.

The container is the plant's entire world — its soil volume, its water supply, its drainage, its root space. Choosing the right container is not a cosmetic decision. It directly determines whether the plant thrives, merely survives, or quietly drowns.

The One Rule: Drainage Is Not Optional

Every container must allow excess water to escape. Without drainage, water accumulates at the base, saturates the soil, displaces the air that roots need, and creates the oxygen-starved, waterlogged conditions that cause root rot. Root rot kills more container plants than drought, frost, pests, and disease combined.

Every pot needs drainage holes. If a container does not have them, drill them. A masonry bit will drill through ceramic and terracotta. A standard drill bit works for plastic and wood. No drainage holes, no healthy roots — there are no exceptions.

The gravel myth: Putting a layer of gravel or broken pottery in the bottom of a pot "to improve drainage" does not improve drainage. It creates a perched water table — a saturated zone at the boundary between the gravel and the soil above it — which actually makes the waterlogging worse by raising the wet zone closer to the root ball. Use the correct potting compost for your container, ensure the drainage holes are clear, and let them do their job. See our Potting Soil, Compost and Growing Media Guide for the right medium for every purpose.

Pot feet and risers — small feet that lift the container a centimetre or two above the surface it sits on — prevent the drainage holes from sitting in a puddle of standing water. A simple, inexpensive improvement that makes a genuine difference, particularly on flat surfaces like paving and decking.

Container Materials: What Each One Does to Your Plants

The material a container is made from affects how quickly soil dries out, how hot the root zone gets, how much the pot weighs, how long it lasts, and how the plant grows. Choosing a material is not purely aesthetic — it has real consequences for the plants inside.

Terracotta (Unglazed Clay)

The original container gardening material. Made from fired clay, left unglazed so the surface remains porous.

What it does to your plants: The porous walls allow air and moisture to pass through, which provides excellent root aeration and helps prevent waterlogging. The evaporation from the pot walls has a mild cooling effect on the root zone in hot weather. Terracotta "breathes" in a way that no other material does.

The trade-off: That same porosity means terracotta dries out faster than non-porous materials. In hot, windy weather, a small terracotta pot can dry out within hours. You water more often. In cold climates, absorbed water can freeze inside the clay walls, causing the pot to crack. Look for frost-proof terracotta if you live where winter temperatures regularly drop below freezing.

Maintenance: Develops an attractive patina of mineral deposits, algae, and moss over time. This can be cleaned off or left as a feature — many gardeners consider aged terracotta more beautiful than new.

Best for: Mediterranean herbs (rosemary, thyme, lavender) that prefer to dry out between waterings. Cacti and succulents. Any plant that resents sitting in damp soil. Traditional garden aesthetics.

Glazed Ceramic

Clay that has been fired at higher temperatures and coated with a glass-like glaze, sealing the surface.

What it does to your plants: The glaze makes the walls non-porous, so moisture does not evaporate through the sides. Soil stays moist longer than in terracotta. This means less frequent watering but a greater risk of overwatering if you are not careful.

The trade-off: Heavy — a large glazed ceramic pot filled with soil and a mature plant is extremely heavy and difficult to move. Fragile — glazed ceramic cracks if dropped or knocked. Not all glazed ceramics are frost-proof; check before leaving outside through winter.

Best for: Moisture-loving plants. Decorative displays where the pot is a visual feature. Indoor use where the non-porous surface protects floors and furniture from moisture.

Plastic

The most widely used container material. Available in every size, shape, colour, and price point.

What it does to your plants: Non-porous — retains moisture well. Lightweight — easy to move. Does not crack in frost the way ceramic does. The walls of a plastic pot in direct sun can get very hot, especially dark-coloured pots, which absorb heat and can overheat the root zone.

The quality spectrum: Cheap, thin plastic becomes brittle with UV exposure and cracks after a season or two. Thicker, higher-grade plastic (often UV-stabilised) lasts years. The best plastic pots rival ceramic in appearance and durability at a fraction of the weight.

Environmental consideration: Plastic pots are petroleum-derived and not widely recycled in practice. Some manufacturers now offer pots made from recycled plastic. If environmental impact matters to you, consider how long the pot will last — a high-quality plastic pot that lasts ten seasons has a smaller footprint than cheap pots replaced every year or two.

Best for: Lightweight installations (balconies, rooftops, hanging structures). Budget-conscious gardening. Situations where pots need to be moved frequently. Growing vegetables where appearance is secondary to function.

Fabric Grow Bags

Bags made from non-woven, pressed fabric (typically polypropylene felt) that has become enormously popular for vegetable growing and container gardening.

What they do to your plants: The breathable fabric walls allow air to reach the root zone from all directions. When roots grow to the edge of the bag, they encounter air and naturally prune themselves — the root tip stops growing and the plant produces side roots instead. This "air pruning" creates a dense, fibrous root system that is far healthier than the circling root ball that develops in a rigid pot.

The trade-off: Fabric dries out faster than plastic or ceramic — expect to water more frequently, particularly in hot weather. Fabric bags are not decorative; they are functional. They cannot be placed on surfaces that are damaged by moisture, as water seeps through the fabric walls. They soften and sag as soil settles, and typically last three to five seasons before the fabric degrades.

Best for: Vegetables (tomatoes, potatoes, peppers, courgettes, beans). Temporary growing setups. Gardeners who value root health and plant performance over decorative appearance. Balconies and rooftops where weight is a concern. See our Raised Garden Beds Guide for permanent raised growing options.

Wood

Planters made from timber — either solid planks or half-barrel style.

What it does to your plants: Wood is a natural insulator. Root zones in wooden planters stay cooler in summer and warmer in winter than those in metal or plastic. Wood is porous, so it provides some air exchange, but less than terracotta or fabric.

Which wood matters: Cedar and redwood are naturally rot-resistant and suitable for direct soil contact without chemical treatment. They weather to an attractive silver-grey. Treated softwood (pressure-treated pine) is cheaper and widely available, but check that the treatment is safe for food growing if you plan to plant edibles — modern treatments are generally safe, but older arsenic-based preservatives are not. Hardwoods (oak, iroko) are extremely durable but expensive.

The trade-off: Wood eventually rots, especially at the base where moisture accumulates. Lining the inside of a wooden planter with landscape fabric or pond liner (with drainage holes left open) extends the timber's life significantly by reducing direct soil-to-wood contact.

Best for: Raised planters and planter boxes. Traditional aesthetics. Permanent outdoor displays. Herb and vegetable planters on patios.

Metal

Galvanised steel, corten (rusting) steel, zinc, copper, and aluminium planters.

What it does to your plants: Metal is non-porous and conducts heat efficiently. In direct sun, metal planters get extremely hot — hot enough to damage roots in contact with the inner wall. In winter, they offer no insulation — the root zone gets as cold as the outside air.

The trade-off: The heat issue is the primary concern. Metal planters in full sun in warm climates can cook roots. Insulating the inside with bubble wrap or polystyrene, or positioning metal planters where they receive shade for part of the day, mitigates the problem. Some gardeners use metal planters as decorative outer sleeves, placing a plastic inner pot inside them.

Best for: Contemporary and industrial garden design where the aesthetic is the priority. Shaded positions. Cooler climates where overheating is less of a concern. Corten steel planters develop a beautiful rust-coloured patina that many architects and designers specify.

Concrete and Stone

Cast concrete, reconstituted stone, and natural stone containers.

What it does to your plants: Heavy, insulating, and durable. Root zones in stone planters experience less temperature fluctuation than in metal or thin plastic. Concrete is mildly alkaline when new, which can raise the pH of the potting soil slightly — usually negligible, but worth noting for acid-loving plants.

The trade-off: Extremely heavy, particularly when filled with soil. Difficult or impossible to move once planted. Concrete can crack in severe frost cycles, though quality cast concrete is more resistant than cheap moulded versions.

Best for: Permanent installations. Entrance displays. Feature planters that anchor a garden design. Situations where the weight is an advantage (wind resistance, stability).

Fibre and Resin

Lightweight composite materials (fibreglass, fibre-cement, polyrattan, polyresin) moulded to resemble stone, concrete, terracotta, or other natural materials.

What they do to your plants: Functionally similar to plastic — non-porous, lightweight, moisture-retentive. The advantage is aesthetic: a good fibreglass planter is visually indistinguishable from stone or concrete at a fraction of the weight.

Best for: Situations where the look of stone or concrete is desired but the weight is not practical — balconies, rooftops, upper floors, and positions where heavy containers would be structurally problematic.

Self-Watering Planters

A self-watering planter includes a built-in water reservoir beneath the soil. Water is drawn upward from the reservoir into the root zone by capillary action — the same principle that draws water up through a sponge. You fill the reservoir periodically rather than watering the surface daily.

The advantages are significant. Plants receive a consistent, steady supply of moisture rather than the wet-dry cycle of surface watering. The root zone stays evenly moist without becoming waterlogged (provided the reservoir has an overflow outlet so it cannot overfill). Watering frequency drops from daily to every few days or even once a week, depending on conditions.

Best for: Busy people. Holiday periods. Balcony and rooftop gardens where daily watering is impractical. Vegetables and herbs that need consistent moisture (tomatoes, peppers, lettuces, basil). Indoor plants in offices and communal spaces.

The limitation: Self-watering planters are not suitable for every plant. Species that prefer to dry out between waterings — succulents, cacti, Mediterranean herbs, and many native plants adapted to dry conditions — can suffer in the constantly moist environment a self-watering system provides.

Choosing the Right Size

The root system determines the minimum pot size, not the visible plant above the soil. A plant may look modest above ground but need a substantial root volume to thrive.

General guidelines: Herbs and small annuals — minimum 15 cm (6 in) diameter. Peppers, dwarf tomatoes, and most vegetables — minimum 30 cm (12 in) diameter, ideally larger. Full-sized tomatoes, courgettes, and larger fruiting plants — minimum 40 cm (16 in) diameter or equivalent volume. Shrubs and small trees — minimum 45–60 cm (18–24 in) diameter, deeper than wide.

Bigger is almost always better. A larger pot holds more soil, which buffers temperature changes, holds more moisture and nutrients, and gives roots room to develop without becoming root-bound. The main constraints on going larger are weight, cost, and the volume of potting compost required to fill the pot. But for plant health, err on the side of larger rather than smaller.

When potting up (moving a plant to a larger container): Go up one or two pot sizes at a time. Placing a small plant in an enormous pot means a large volume of soil stays wet around roots that are not yet big enough to use that moisture — increasing the risk of waterlogging.

Shape: More Than Decoration

Tall, narrow pots suit deep-rooted plants (carrots, parsnips, roses, small trees) and provide visual height. But a narrow base relative to the height makes the pot unstable — a tall, narrow pot with a large plant can topple in wind.

Wide, shallow pots suit plants with spreading root systems (strawberries, most herbs, succulents, lettuce). They dry out faster because the wider surface area increases evaporation.

Tapered pots (wider at the top than the base) make repotting easier — you can slide the root ball out. Pots that are wider at the middle or the base than at the top trap the root ball and make repotting difficult or impossible without breaking the pot.

Rectangular troughs and window boxes maximise growing space in narrow areas — along railings, on windowsills, against walls. Efficient use of space for herbs, salad leaves, and flowers.

Weight: The Overlooked Practical Question

A large ceramic or concrete planter filled with moist potting compost and a mature plant can weigh 50 kg (110 lb) or more. This has practical consequences that are easy to overlook before purchase.

Can your surface support it? Balconies and rooftops have structural weight limits. A row of large stone planters along a balcony edge could exceed the designed load capacity. If in doubt, consult a structural engineer or building manager before loading a balcony with heavy containers.

Can you move it? A large planter that cannot be moved after planting is a permanent fixture. If you rent, or if you might want to rearrange your garden, lightweight materials (plastic, fabric, fibre composite) give you flexibility. Plant caddies with wheels under heavy pots allow repositioning.

Stability vs portability: Heavier containers resist wind and accidental knocking. Lighter containers can blow over in storms. A lightweight planter in an exposed position may need anchoring or weighting.

Container Gardening in Practice

What to Grow in Containers

Almost anything will grow in a container if the container is large enough and the growing conditions (light, water, food) are met. Herbs, salad leaves, tomatoes, peppers, strawberries, beans, and chillies are among the most popular and productive container crops.

Ornamental plants — flowers, grasses, and even shrubs and small trees — thrive in containers when given adequate root space and feeding. A well-planted container group can transform a patio from a bare expanse into a lush, inviting space.

For indoor growing under lights, see our Plant Grow Lights Guide. For soilless container approaches, see our Hydroponics and Indoor Growing Guide.

The Soil Question: Why Garden Soil Does Not Work in Pots

Soil from the garden — however good it is for borders and beds — compacts in containers, drains poorly, and may harbour weed seeds, diseases, and pests. It is too heavy, too dense, and too variable for container use.

Always use a formulated potting compost designed for containers. These mixes are engineered to balance drainage, moisture retention, aeration, and nutrient supply in the confined environment of a pot. See our Potting Soil, Compost and Growing Media Guide for a detailed breakdown of what to choose and why.

Watering Containers: The Skill That Makes or Breaks Everything

Container plants depend entirely on you for water. They have no access to groundwater, no deep soil reserves to draw from, and no natural rainfall absorption beyond what lands directly in the pot. In summer, a large pot in full sun can need watering every day — a small pot or a fabric bag can need it twice a day.

How to water well: Water thoroughly until water flows from the drainage holes. This ensures the entire root ball is moistened, not just the surface. A light sprinkle that wets only the top centimetre encourages shallow root growth and leaves the deeper roots dry.

How to tell when to water: Push your finger into the compost to a depth of 2–3 cm (about an inch). If the soil at that depth feels dry, water. If it feels moist, wait. The surface often looks dry while the deeper compost is still adequately moist — judging by the surface alone leads to overwatering.

Mulching containers — a layer of bark, gravel, or stones on the soil surface — reduces evaporation and keeps the root zone cooler. A 2–3 cm layer makes a noticeable difference to how often you need to water.

For automated watering, see our Garden Irrigation Systems Guide — drip irrigation connected to a timer is particularly effective for container collections.

Feeding Container Plants

Nutrients in potting compost are depleted by plant growth and washed out by watering. Container plants need regular feeding throughout the growing season.

Slow-release fertiliser mixed into the compost at planting provides a steady, low-level supply for several months. Convenient and low-maintenance.

Liquid feed (diluted into the watering can) provides a quick nutrient boost and allows you to adjust the feed for different plants and growth stages. Tomato feed (high in potassium) encourages fruiting; a balanced general feed supports leafy growth.

Frequency: Feed every one to two weeks during active growth. Reduce feeding in autumn and stop through winter when plant growth slows or stops.

Overwintering Containers

Plants in containers are more vulnerable to cold than the same plants in the ground. In-ground roots are insulated by the surrounding earth; roots in a container are separated from the outside air by only the pot wall.

Protecting containers through winter: Group pots together (they insulate each other). Move them against a sheltered wall. Wrap the pot (not the plant) in bubble wrap, hessian, or horticultural fleece to insulate the root zone. Raise the pot off a cold surface (paving conducts cold upward into the pot).

Frost-vulnerable pots: Terracotta, glazed ceramic, and concrete can crack when absorbed water freezes and expands inside the material. Move frost-vulnerable pots under cover for winter, or choose frost-proof grades.

Creative Container Approaches

Hanging Baskets

Wire baskets lined with coir, moss, or synthetic liner and planted with trailing flowers, herbs, or strawberries. Hung from brackets, pergolas, or shepherds' hooks.

The challenge: Hanging baskets dry out extremely fast — they are exposed to air on all sides and cannot hold large volumes of soil. Daily watering (sometimes twice daily) is essential in warm weather. Self-watering reservoirs built into some hanging basket designs reduce this burden.

What to look for: A sturdy bracket rated for the weight of a fully watered basket (which is considerably heavier than you expect). A liner that retains some moisture. Adequate size — larger baskets hold more soil, dry out more slowly, and give plants more room.

Window Boxes and Railing Planters

Narrow, rectangular containers designed for windowsills, balcony railings, or wall-mounted brackets. Efficient use of space for herbs, salad leaves, and trailing flowers.

What to look for: Secure mounting — a window box full of wet compost falling from a height is dangerous. Ensure brackets and fixings are rated for the weight. Drainage holes with saucers to catch runoff (especially important above pedestrian areas). Adequate depth — at least 15 cm (6 in) for most herbs and annuals, deeper for larger plants.

Vertical Planting and Wall Planters

Modular planting systems that attach to walls, fences, or freestanding frames, allowing plants to grow vertically. Particularly useful for maximising growing space in very small areas.

Considerations: Vertical planters drain downward — the top pockets dry out fastest. Watering systems that deliver water to the top (which then trickles down through each level) are more effective than watering each pocket individually. Check the weight capacity of the wall or fence before mounting a full system.

Repurposed and Upcycled Containers

Old buckets, wooden crates, metal colanders, vintage sinks, tyre planters, and countless other salvaged items can be turned into containers. This is creative, environmentally conscious, and often produces the most characterful displays.

The essentials remain the same: Drainage holes. Adequate size. No toxic materials in contact with soil (particularly important for food growing — avoid containers that previously held chemicals, and be cautious with tyres, which can leach chemicals over time). Disinfect any previously used container with a dilute bleach solution before planting.

Common Mistakes Buyers Make

No Drainage Holes

The most common and most harmful mistake. Without drainage, plants drown. Always check — and drill holes if necessary — before planting.

Too Small

Buyers consistently underestimate how large a container needs to be. A plant that looks fine in a small pot today will be root-bound and struggling within weeks. Go larger than you think you need.

Gravel in the Bottom

The gravel-in-the-bottom-for-drainage advice is persistent and wrong. It creates a perched water table that makes drainage worse. Fill the pot with potting compost from bottom to top.

Using Garden Soil

Garden soil compacts, drains poorly, and introduces problems. Use formulated potting compost in containers, always.

Forgetting to Feed

Container plants exhaust the nutrients in their potting compost within weeks. Without regular feeding, they starve in plain sight.

Dark Pots in Full Sun

Dark-coloured metal and plastic pots absorb heat and can overheat the root zone. In hot, sunny positions, choose light-coloured or insulated containers.

Not Considering Weight

A large stone planter on a balcony is potentially a structural concern. Think about weight before purchasing, not after filling.

Comparison Table: Container Materials at a Glance

Pre-Purchase Checklist

• Does the container have drainage holes? If not, can you drill them?
• Is the material appropriate for your climate — frost-proof if you leave pots outside in winter?
• Is the pot large enough for the plant's mature root system, not just its current size?
• Can the surface where you plan to place the container support its weight when full?
• Will you need to move the container? If so, is the material light enough, or do you need a plant caddy with wheels?
• For food growing: is the container material food-safe (no leaching of chemicals into soil)?
• Does the drying rate of the material match your watering commitment? Terracotta and fabric dry fast; plastic and ceramic retain moisture longer.
• Have you selected the correct potting compost for the container type and the plant?
• Do you have a feeding plan for the growing season?
• For hanging baskets and wall planters: are the brackets and fixings rated for the fully loaded weight?

Why Buying Through Amazon Makes Sense

Amazon's container and planter range covers everything from individual pots and grow bag multi-packs to large decorative planters, self-watering systems, and wall-mounted vertical planting kits. Product listings include dimensions, material, drainage features, and weight.

Customer feedback is particularly valuable for containers, where the reality of a product — its true colour compared to the listing photo, how it performs after a full season outdoors, whether it survives winter, and whether the drainage holes are actually adequate — emerges only through real-world use. Reviews with photographs from buyers who have used a container for a full growing season reveal far more than the product description.

Amazon Marketplace Protections

When you purchase through Amazon, several consumer protections apply. Products sold directly by Amazon are covered by standard consumer rights legislation, including the right to return items within a specified period.

For products sold by third-party sellers on the Amazon Marketplace, the A-to-Z Guarantee provides additional protection. If an item does not arrive, arrives damaged, or is materially different from what was described, Amazon will investigate and, where appropriate, issue a refund.

Amazon Renewed products — professionally inspected and restored items — come with their own guarantee, providing confidence when purchasing pre-owned equipment at reduced prices.