The Air Above Your Garden Is Empty
A standard 4×8 raised bed contains 32 square feet of soil. The cube of air above it — six feet up — contains 192 cubic feet of growing volume that almost no garden uses. Vertical gardening is the simple realization that the third dimension is free.
A trellis takes the same floor space as a tomato cage but produces several times more food. A pocket wall on a sunny exterior wall produces a salad in three feet of wall space. A vine on a porch railing harvests light at the height where buildings cast their shadows least. The leverage is real, and the techniques are simple.
Three Vertical Strategies
Vertical gardening isn’t a single technique. It’s three related ideas:
1. Climbing crops on structures. Plant something that wants to climb. Give it a trellis, fence, or wire. Pole beans, peas, cucumbers, vining tomatoes, malabar spinach, hardy kiwi, hops, scarlet runner beans. The plant does the work of growing up.
2. Stacked planters and pocket walls. Container systems that put soil pockets at multiple heights. Felt pocket walls, stacked terra cotta pots, ladder shelves of pots, gutter gardens fixed to a fence. Each pocket is its own tiny garden; collectively they create a wall of food.
3. Living walls. Engineered systems where plants are integrated into the wall itself, often with built-in irrigation. Beautiful, expensive, and worth knowing about but usually overkill for a home grower. The simpler systems above produce more food per dollar.
Climbing Crops Worth Growing
Plants that climb naturally, with how much vertical space they want:
- Pole beans — 6–8 feet. Most prolific climber per square inch of soil. Plant six seeds at the base of a sturdy bamboo tripod and feed a family.
- Sugar snap peas — 4–6 feet. Cool-season counterpart. Trellis with chicken wire or sticks.
- Cucumbers — 4–6 feet. Need a sturdy structure; the fruit is heavy. Trellised cukes are straighter, healthier, and easier to harvest.
- Indeterminate tomatoes — 6–8 feet if you let them. Stake or string-train them up. One plant produces more in vertical space than three in cages.
- Malabar spinach — 6–10 feet. A heat-loving climbing green with red stems. Beautiful, edible, drought-tolerant.
- Scarlet runner beans — 8–12 feet. Red flowers covered in hummingbirds, edible pods and beans.
- Hardy kiwi (Actinidia arguta) — 15+ feet. Perennial vine, takes 4–5 years to fruit, but produces grape-sized fuzzless kiwis for decades.
- Hops — 15+ feet. Aggressive perennial vine. The cones are useful for brewing and herbal sedatives.
Structures
You can spend a hundred dollars on a fancy trellis. You don’t need to. Five structures I’ve used:
Bamboo tripod. Three 8-foot bamboo poles lashed together at the top. Beans climb the legs. Costs $5 and lasts three seasons.
Cattle panel arch. A 16-foot cattle panel bent into an arch between two raised beds. Costs about $30. Cucumbers and small squash climb up and over. Walking under it is one of the better small pleasures.
Florida weave. T-posts every 6 feet with twine woven between them at increasing heights as the tomatoes grow. Cheapest tomato support known to humanity. Take it down at season’s end and reuse the posts.
String trellis. A horizontal wire at 8 feet, twine dropping down to each plant. Plants are clipped to the twine and trained up. Used in most commercial high tunnels for tomatoes and cucumbers.
Cattle-panel A-frame. Two cattle panels leaned against each other to form an A-frame. Use the inside as shaded growing space for lettuce that bolts in heat; vines climb the outside.
The Apartment Version
For balconies, railings, and walls:
Felt pocket planters mount on any vertical surface and produce strawberries, herbs, lettuce, and trailing nasturtium beautifully. Look for 6–10 pocket panels in UV-stable felt.
Railing planters sit on top of any standard railing. Trail strawberries or sweet alyssum over the edge; plant compact herbs in the bed.
String trellis on a wall. Eye hooks at the top of a sunny wall, twine dropping down. Plant climbers at the base in containers. The wall acts as both heat sink and structure.
Our patio garden guide covers more apartment-scale vertical strategies.
The Frame
A garden that grows up rather than out treats space the way nature does — in layers. Forests are vertical. Meadows are vertical when you look closely. A flat one-layer garden is the unusual case; vertical is the default biological pattern.
Add one trellis this season. Plant something that climbs. Notice next year how much more food came from the same patch.
Frequently Asked Questions
What is vertical gardening?
Vertical gardening is the practice of growing plants upward rather than outward — using trellises, wall planters, pocket walls, towers, and climbing crops to multiply growing space in a small footprint. A 4-foot trellis can double or triple the yield of a 4-square-foot patch by giving climbers (beans, cucumbers, peas, squash) vertical room.
What plants are best for vertical gardening?
Climbers: pole beans, peas, cucumbers, vining squash, tomatoes (with support), nasturtiums, climbing spinach (Malabar). Wall pockets and towers: lettuce, herbs, strawberries, kale, chard. Hanging baskets: cherry tomatoes, strawberries, trailing herbs, peppers. Vertical systems work best with shallow-rooted, fast-maturing crops.
How do vertical gardens save space?
By converting unused vertical air space into growing surface. A 4×8 conventional bed has 32 square feet of growing area; the same bed with a 6-foot trellis added has effectively 80+ square feet because climbing crops use the column above the bed. Apartment balconies and small yards routinely double their food output by adding vertical structure.
Are vertical garden walls worth it?
It depends. DIY pocket-wall systems made from felt, pallets, or recycled materials are excellent value. Commercial 'living wall' systems are often expensive and require sophisticated irrigation. Start with a simple trellis or pallet wall before investing in any commercial system. The cheap version usually outperforms the marketed one.
Can I grow tomatoes vertically?
Yes — indeterminate tomato varieties are ideal for vertical growing. Stake or trellis to 6+ feet, prune to one or two main stems, and tie up weekly during the growing season. A single vertical tomato plant can produce 20+ pounds of fruit in the footprint of a single square foot. Determinate (bush) varieties don't benefit much from vertical training.
Written by E. Silkweaver