Vertical gardening: grow up, not out

Vertical growing is not a workaround — it's a genuinely productive technique that also improves airflow around crops, makes harvesting easier, and turns bare fences and walls into productive space.

Why grow vertically

The case for growing vertically is strongest when ground space is limited, but even gardeners with plenty of room find vertical growing valuable for specific reasons:

• Space efficiency. A climbing bean plant supported by a 1.8 m cane takes up roughly 30 cm of ground space but produces at canopy height across the full height of its support. The same ground footprint as one sprawling squash plant can support a wigwam of eight climbing bean plants.
• Improved airflow and reduced disease. Many fungal diseases — botrytis, powdery mildew, blight — are worsened by poor airflow around crowded plants. Training crops upwards, rather than letting them sprawl on the ground, exposes leaves to moving air on all sides and significantly reduces the humid, still conditions these diseases favour.
• Easier harvesting. Beans, cucumbers and peas hanging at eye level or arm height are much easier to pick than those lying hidden among foliage on the ground. You're also less likely to miss a pod that's overgrown and become tough.
• Accessibility. Vertical growing at a comfortable height is practical for people who find bending down difficult. A waist-height planting pocket or a raised trough with a trellis above it can be cultivated without bending at all.
• Using otherwise dead space. A bare fence, a blank wall, the side of a shed — these are often the most useful surfaces in a small garden and commonly wasted. Vertical growing converts them into productive growing space.
• Shade management. Tall vertical plantings create shade, which can be a benefit (sheltering lettuce from bolting in summer) or a consideration (don't place tall structures to the south of other beds where they'll block sunlight all day — or north, in the Southern Hemisphere).

Methods and structures

Vertical growing encompasses a range of different methods, from simple cane structures to purpose-built wall systems:

• Trellises. A flat lattice of wood, wire or mesh fixed to a wall, fence or freestanding frame. Ideal for peas, climbing beans, cucumbers and small-fruited squash. Plants either wind themselves naturally (peas, climbing beans) or need tying in (cucumbers, tomatoes).
• Arches and tunnels. Metal or wooden arches fixed between two beds create a productive tunnel of climbing plants — beans, nasturtiums, squash — and a beautiful garden feature. Walking through a bean tunnel to harvest is one of the more pleasing experiences in growing.
• Obelisks and wigwams. Freestanding structures of canes, hazel rods or metal frames, tied at the top. Ideal for a single plant's worth of climbing beans or a feature planting of sweet peas mixed with edible crops. Easy to assemble and move.
• Wall pockets and felt planters. Fabric pockets sewn together in a panel and hung on a wall, fence or railing. Each pocket holds a small amount of compost and one or two plants — ideal for herbs, salad leaves, strawberries and radishes. Lightweight and easy to move.
• Hanging baskets. Often used for ornamental plants, but excellent for trailing tomatoes, strawberries and herbs. Require consistent watering (they dry out very quickly) but use no floor space at all.
• Stacked or tiered planters. Purpose-made or improvised towers of containers that hold compost in multiple layers. Good for strawberries, herbs and salad crops. Each tier needs individual watering attention.
• String systems. A horizontal fixing point at height (a wall, beam or rail) with strings dropped vertically for plants to wind around. Used commercially for tomatoes and cucumbers; easily adapted for home growing. Very simple and low-cost.

Upcycled and low-cost supports

Some of the most effective vertical growing structures cost almost nothing:

• Wooden pallets. A pallet mounted vertically on a wall, with fabric or landscape membrane stapled to the back, makes an instant wall planter. Fill the gaps between slats with compost and plant herbs, salad leaves or strawberries. Check that pallets are marked HT (heat-treated) rather than MB (methyl bromide treated, which should be avoided for food growing).
• Old guttering. Sections of guttering fixed horizontally at different heights on a fence or wall create long, shallow planting channels. Excellent for salad leaves, radishes, spring onions and herbs. Drainage holes need to be drilled at regular intervals. Guttering is often available cheaply from reclamation yards or renovation skips.
• Bamboo canes. The backbone of most low-cost vertical growing — lash them into a wigwam, an A-frame or a fan shape against a wall. Twine or garden wire tied between canes creates the framework. Reuse them year after year.
• Twiggy branches. Hazel, birch or other twiggy branches pushed into the soil create natural, attractive supports for peas and lightweight climbing beans. Free if you have access to a garden, hedge or woodland. They break down in the compost at the end of the season.
• Old bed frames and ladders. A metal or wooden bed frame stood upright against a wall makes an instant trellis. A wooden ladder propped against a wall at an angle creates a series of horizontal rungs to train plants across.
• Wire mesh. Galvanised wire or chicken wire stretched between posts creates a permanent trellis surface for climbing crops. Cheap, durable and easily fixed to any structure.

What suits vertical growing

Some crops are natural climbers; others can be trained upwards with a little guidance:

• Climbing beans (runner beans, climbing French beans): among the most productive vertical crops, producing over a long season from a small ground footprint. They twine naturally around supports and need nothing more than a cane or string to work with.
• Peas: tendrilled climbers that attach to mesh, netting or twiggy supports. Even the tallest mangetout varieties reach only 1.5–1.8 m; dwarf varieties stay under a metre. Very easy to grow vertically.
• Cucumbers: natural climbers outdoors (as long as the climate is warm enough); train them up a trellis and tie in the main stem. They're easier to harvest and less prone to rot when kept off the ground.
• Climbing squash and courgettes: smaller squash varieties (acorn squash, small pumpkins) can be trained up a strong trellis with individual fruit supported in slings made from old tights or netting. Courgettes are not climbers but can be tied in an upright position to a stake or trellis to save ground space.
• Tomatoes (cordon types): naturally grow upright and are typically trained up a single vertical string or cane. Tall cordon varieties can reach 2 m or more, making use of full wall height.
• Strawberries: grow well in wall pockets, hanging baskets and stacked planters. The runners naturally trail downward, making them visually attractive as well as productive. Keeping fruit off the ground reduces slug damage and botrytis.
• Herbs: basil, parsley, chives, mint and thyme all do well in wall pockets. Mint in particular benefits from being confined — in a pocket or small pot — rather than being allowed to spread at ground level.
• Leafy greens and salad: lettuce, spinach, chard, pak choi and salad mixes grow well in wall pockets and guttering channels. They have shallow root systems and are fast-growing, making them ideal for the limited compost volume of vertical planters.

Crops that don't suit vertical growing well include those with very heavy fruit (large pumpkins, main-crop marrows), those with extensive root systems (potatoes, parsnips), or those that spread outwards rather than upward (sprawling courgette varieties, large brassicas).

Supporting structures and securing safely

The safety and effectiveness of vertical growing depends entirely on structures being secure. A fully grown climbing bean plant carrying a season's worth of pods, saturated with rain, can exert considerable force on its supports — more than most people anticipate when they put in a few canes in spring.

• Fix wall-mounted structures securely. Use appropriate fixings for your wall type — masonry anchors in brick or stone, timber screws into wooden fencing with backing plates to distribute load. Wire stretched loosely between two screws will pull out when a heavy crop loads it in wind.
• Drive cane supports deep. Canes and posts used as freestanding supports should be driven at least 30 cm into the ground, or secured into a pot with a heavy base. Cross-bracing two canes at the top dramatically increases stability.
• Check fixings mid-season. Look over vertical structures in mid-summer when crops are at full size and weight. Retighten any loose ties; add additional fixings to anything that's moving. This takes ten minutes and prevents the whole thing coming down later.
• Weight distribution in pots. Vertical structures rising from containers must be counterbalanced by a heavy pot base. Use large, heavy containers (stone, concrete, large terracotta, metal troughs filled with wet compost) rather than lightweight plastic for anything carrying a significant vertical structure.

Watering challenges and solutions

Vertical growing presents a genuine watering challenge: compost at height, in pockets and hanging baskets, dries out faster than anything at ground level. The top of a wall planter in full sun in warm weather may need watering more than once a day during a hot spell.

• Water from the top and allow it to move down through a stacked or layered system. Check each level individually — the top layer dries first, but lower layers can become waterlogged if the top is over-watered without checking below.
• Use a drip irrigation system for large vertical installations. A thin drip tube running down the structure with emitters at each level is the most reliable solution and is easily attached to a timer. Even a small gravity-fed reservoir can supply a section of wall pockets consistently.
• Add water-retaining gel crystals to the compost in wall pockets and hanging baskets. These absorb water when you irrigate and release it slowly between waterings, significantly reducing how often you need to check. They are most useful in small-volume planters.
• Mulch the compost surface in containers and troughs at the base of vertical structures — a layer of gravel, bark or compost slows evaporation from the pot.
• Group pots and planters where possible rather than spreading them across different areas — this makes watering a single task rather than a tour of the garden.

Light and wind considerations

Vertical growing changes the light dynamics of the growing space. Tall structures cast shade that moves across the garden through the day.

• Position tall vertical structures so that shade falls away from other growing areas rather than onto them. In the northern hemisphere, a tall trellis is best on the northern side of a bed; in the southern hemisphere, on the southern side. On a balcony, consider where shade will fall at midday and plan vertical structures accordingly.
• Use the shade you create. A tall trellis of climbing beans casting afternoon shade is a perfect spot for lettuces and salad leaves that would otherwise bolt in summer heat. Plan shade as a resource, not just an inconvenience.
• Wind is more of an issue at height. Balconies, rooftop gardens and exposed walls expose plants to wind speeds that ground-level beds rarely see. Choose compact, sturdier varieties for exposed positions; stake stems firmly; and use solid barriers (fence panels, screens) rather than open mesh for wind protection where possible — open mesh at height can channel and accelerate wind rather than blocking it.

Great for balconies and renters

Vertical growing is particularly valuable for people who rent their home or have only a balcony or courtyard — situations where digging, building raised beds or permanent modifications may not be possible or allowed.

A collection of containers with vertical supports — wigwams, trellises fixed to the container rather than the wall, a freestanding obelisk — requires no permanent modification to any surface. It can be set up in an afternoon, moved as needed, and taken away entirely when you move. Wall pockets hung on hooks rather than screws are similarly temporary. For balconies, check weight limits before loading heavy containers or permanent structures, and position heavier pots near load-bearing walls rather than in the centre of the space.

For a full guide to making the most of limited growing spaces without permanent modifications, see our growing food in small spaces guide.

How to set up a vertical growing spot

1. Identify your vertical surface or structure. A fence, wall, the side of a shed, a freestanding frame or a collection of containers — choose the most sheltered and sunny surface available.
2. Assess the sun and wind. Note how many hours of direct sun the surface receives and whether it's exposed to strong wind. This determines what crops you can grow and whether you need wind protection.
3. Choose your structure. Match the structure to your crops: a trellis or cane wigwam for climbers; wall pockets or guttering for herbs and salad; a string system for tomatoes. Build or assemble it before planting so roots aren't disturbed later.
4. Fix the structure securely. Test it by pushing against it with your hand. If it wobbles, add fixings. A structure that seems stable in spring will carry far more weight in summer.
5. Choose your compost and containers. Use good peat-free compost with added drainage material for wall pockets and hanging baskets; larger containers for climbing crops at the base of a trellis.
6. Plant or sow into position. Guide the first growth onto the support — tie loosely with soft twine or garden clips. Check and retrain stems weekly during active growth.
7. Establish a watering and feeding routine from the start. Small-volume vertical planters dry out fast. Check daily in warm weather. Start liquid feeding after six to eight weeks for contained crops.

Vertical gardening checklist

• Vertical surface or structure identified and assessed for sun and wind.
• Structure built and fixed securely before planting.
• Crops matched to the support type — climbers on trellises; salad in pockets.
• Adequate compost volume for each crop; drainage ensured.
• Position avoids casting shade onto other growing areas (or shade is used intentionally).
• Daily watering checks in warm weather; drip system or water-retaining gel in small-volume planters.
• Liquid feeding started after six to eight weeks and continued through the season.
• Stems tied in and guided onto support regularly during active growth.
• Structure checked mid-season for stability under full crop weight.