A vertical garden for a small balcony starts with a sun map: count how many hours of direct sun each wall, rail or corner gets before you choose plants. Warm-season crops such as tomatoes, peppers and cucumbers need six to eight hours of sun a day, while most herbs and cool-season greens can manage with three to five, according to NC State Extension. Plan the space in winter, then plant pockets, rail planters or a trellis in spring.
A balcony, a patio wall or a sunny stretch of fence can grow a surprising amount of food. Small-space gardens succeed or fail on planning: which wall gets enough sun, how much weight it can hold, and which plants actually fit in a pocket or a rail planter. Here's how to plan one step by step, plus the plants that do best growing up instead of out.
Why plan a vertical garden in winter?
A vertical garden is easiest to plan in winter, when you can measure, order seeds and put up hardware before the spring rush. Seed racks empty fast in spring, nurseries get crowded, and it's easy to buy plants before you know where they'll go.
Keep one thing in mind: the sun is much lower in winter than in summer. A spot that's shaded by a railing or the balcony above in December may get more direct sun by June, and the reverse can happen too. Use winter to make a first sun map, then check it again in early spring before you plant.
How to plan a vertical garden for a small balcony, step by step
Planning a vertical garden for a small balcony takes six steps: map the sun, measure the space, choose a structure, pick plants, plan the watering and set a planting calendar.
1Map your sun
On a clear day, check your space every hour or two and note when each wall, rail or corner is in direct sun. Add up the hours. According to NC State Extension, warm-season vegetables and fruits need six to eight hours of sun a day, while most herbs and cool-season greens can manage with three to five hours of direct sun.
2Measure the space and check what it can hold
Measure the width and height of each surface you might use. Then think about weight: soil gets heavy when it's wet. NC State Extension notes that a 20-inch container with mature plants, roots and moist mix can weigh up to 100 pounds. Look for solid fence posts, sturdy railings or wall studs to hang from, and keep the biggest pots on the floor. If you rent or live in a building with an HOA, check the rules on attaching anything to walls or railings, and on water dripping onto the balcony below.
3Choose a vertical structure
Match the structure to the plants you want:
- Pocket planters hang flat against a wall or fence and suit herbs, lettuce and strawberries. A fabric option like our hanging vertical grow bag is a single 2-foot bag with 6, 8 or 10 side pockets and a built-in strap for a fence, wall or rail, and it folds flat for storage at the end of the season.
- Rail planters sit over or hang from a balcony railing and work well for herbs and trailing flowers.
- Trellises and netting let climbers such as peas, pole beans and small cucumbers grow up from a pot on the floor. See our plant supports and trellises collection.
- Tiered shelves or stands hold several regular pots in the footprint of one.
4Pick plants for your light and planter size
Small pockets have little room for roots, so choose compact plants for them and save larger crops for deep pots. The plant lists below are a good place to start.
5Plan how you'll water
Vertical gardens dry out faster than a garden bed. Small containers hold less water, and NC State Extension notes that small or dark-colored containers dry out faster, as do wood and unglazed ceramic. Fabric loses moisture quickly too, especially in wind and sun. Plan to water often in warm weather, starting at the top so water trickles down to the lower pockets. Place a tray or saucer below to catch drips. To check the mix a few inches down instead of guessing from the surface, see our guide on how to use a soil moisture meter. Our irrigation and watering collection has options if you'd rather not carry a watering can every day.
6Set your planting calendar
Look up your area's average last frost date through your local Cooperative Extension office. Cool-season crops such as lettuce, spinach and peas can usually go out a few weeks before that date. Warm-season plants such as basil, peppers and cucumbers should wait until after it, once nights stay mild. Count back from those dates to decide when to start seeds indoors.
What are the best plants for pocket planters and rail planters?
The best plants for pocket planters and rail planters are compact and shallow-rooted: leafy greens, herbs, strawberries and small trailing flowers.
- Leafy greens: loose-leaf lettuce, spinach, arugula and baby kale. Pick outer leaves and they keep producing for weeks.
- Herbs: thyme, oregano, chives, parsley, mint and basil. Mint spreads fast, so give it its own pocket.
- Strawberries: a classic for hanging planters, since the fruit hangs clear of the ground.
- Edible and trailing flowers: nasturtiums, violas and calibrachoa add color and soften the look of a wall.
Which vegetables grow best on a balcony trellis?
Snap peas, pole beans and compact cucumbers grow best on a balcony trellis, planted in a deep container at its base.
- Climbers: snap peas, pole beans and compact cucumbers grow up a trellis from a deep container.
- Compact fruiting plants: cherry or patio tomatoes and small peppers do well in large pots near the wall, ideally in your sunniest spot.
Skip large sprawling crops like full-size squash and big tomato varieties in pockets. They need far more root room than a pocket can give.
What soil and fertilizer does a vertical garden need?
A vertical garden needs a quality potting mix, not garden soil. Garden soil packs down in containers, drains poorly and can bring in weed seeds, pests and disease. A lightweight mix also keeps hanging planters easier on fences and railings.
Because frequent watering flushes nutrients out of small containers, most edibles benefit from regular feeding through the season. A slow-release fertilizer at planting, or a diluted liquid feed every few weeks, works for most greens and fruiting plants. Herbs need less, and too much fertilizer can weaken their flavor.
Can you plant a balcony garden in winter?
A balcony garden can go in during winter in mild-winter areas such as much of the South and coastal West. Lettuce, spinach, parsley, cilantro and chives often grow well through the cool months. Your sun map matters even more in winter, so put your planters in the brightest spot you have and watch for the occasional frost warning.
Everywhere else, a few winter jobs will put you ahead: order seeds, buy potting mix, install hooks or brackets, and test that your chosen spot drains without soaking the neighbors.
Frequently asked questions
How much sun does a vertical garden need?
A vertical garden needs three to five hours of direct sun a day for herbs and leafy greens, according to NC State Extension. Tomatoes, peppers, cucumbers and other warm-season crops do best with six to eight hours. Map your sun before you choose plants.
What grows best in a pocket planter?
Compact, shallow-rooted plants grow best in a pocket planter: loose-leaf lettuce, spinach, herbs such as thyme, chives and parsley, strawberries, and small trailing flowers. Avoid large tomatoes, squash and deep-rooted crops, which need much more root space than a pocket holds.
How often should I water a vertical garden?
Water a vertical garden more often than a garden bed. In warm, sunny or windy weather, small pockets can need water every day. Check the top inch of the mix, water from the top so it trickles down, and adjust as the weather changes.
How heavy is a vertical garden?
A vertical garden gets heavy once the mix is wet. NC State Extension notes that a single 20-inch container with mature plants and moist mix can weigh up to 100 pounds. Hang planters from solid posts, sturdy railings or wall studs, and keep large pots on the floor.
Can I use garden soil in a vertical garden?
No, use potting mix in a vertical garden instead of garden soil. Garden soil can carry weed seeds, insects and disease and may not drain well in containers, according to NC State Extension. A lightweight potting mix also puts less weight on fences and railings.
When should I plant a balcony vegetable garden?
Plant a balcony vegetable garden around your area's average last frost date. Lettuce, spinach and peas can usually go out a few weeks before that date. Basil, peppers and cucumbers should wait until after it, once nights stay mild. Your local Cooperative Extension office lists the date.
