Balcony Plant Calendar 2026: What to Plant Every Month (+ Free PDF)

Growing on a balcony means working with nature’s timing — and the biggest mistake apartment gardeners make isn’t bad technique, it’s bad timing. Starting tomatoes too late. Missing the garlic window by six weeks. Sowing lettuce in July heat when it will bolt within a fortnight.

This is the month-by-month balcony plant calendar I’ve been refining since 2023, based on growing in a west-facing apartment balcony in zone 7 (Western Europe). It tells you exactly what to start, what to sow directly outside, and what to harvest in each month of 2026.

Table of Contents

• How to Use This Calendar
• January: Plan and Start Chillies
• February: First Seeds Indoors
• March: Early Outdoor Sowings
• April: The Transition Month
• May: Main Outdoor Planting
• June: Succession Sowing
• July: Peak Season Management
• August: Second Season Begins
• September: Autumn Planting
• October: Harvest and Wind Down
• November–December: Winter Growing
• My Experience: What Actually Worked in 2025
• Quick-Reference Summary Table
• FAQ

How to Use This Calendar {#how-to-use}

Two variables determine your timing: hardiness zone and balcony orientation.

All timings are based on a temperate Northern Hemisphere climate (zones 6–9), covering most of Western and Central Europe and much of the UK and US East Coast. Adjust 2–4 weeks later for colder zones (5 and below), or 2 weeks earlier for warmer zones (9b–10).

Balcony orientation matters more than most guides admit:
– South/West facing — maximum sun, warm microclimate, push timing 1–2 weeks earlier than this guide
– North/East facing — cooler by 3–5°C, stick to shade-tolerant crops; skip tomatoes and peppers unless you have a very bright north balcony
– High-rise (above 6th floor) — significant wind exposure; choose compact varieties, use windbreaks, water daily in summer

January: Plan and Start Chillies {#january}

January is the month that determines your entire 2026 season. Fail here and you’ll be buying plants in May at double the cost.

The one thing you must do in January: start chilli and pepper seeds indoors. They need 12–16 weeks of growth before outdoor transplant (mid-May in most of Europe), which means a January start is not optional — it’s the only way to get a full fruiting season.

What to start on a windowsill:
– Chilli peppers (hot varieties: 14–16 weeks to transplant)
– Sweet bell peppers (12–14 weeks)
– Aubergine/eggplant (14 weeks)

What to order now: Seed catalogues from reputable suppliers sell out popular varieties by late February. Order specific tomato cultivars (‘Tumbling Tom’, ‘Tiny Tim’, ‘Sweet Million’) and any unusual varieties in January. Standard supermarket seeds are usually available year-round but specialist varieties aren’t.

What not to start: tomatoes. A tomato started in January produces a leggy, root-bound seedling that’s impossible to handle by May. Late January is the earliest sensible start; mid-February is better.

February: First Seeds Indoors {#february}

Indoor light improves significantly in February, and seed-starting accelerates.

Start indoors in February:
– Tomatoes (cherry varieties: start 10–12 weeks before outdoor transplant date)
– Leeks (slow-growing, benefit from early start)
– Onions and shallots (10–12 weeks)
– Celery (needs cool start, then consistent warmth)

Grow on the balcony now:
– Microgreens in a tray (sunflower, pea shoots, radish, broccoli) — ready in 7–14 days, possible year-round
– Spinach and mâche in a cold frame or mini-greenhouse cover — these germinate at temperatures as low as 5°C

The February error to avoid: sowing too deep. Most small seeds (lettuce, basil, tomato) need light to germinate — 3–5mm depth maximum, not the 1cm many gardeners instinctively use.

March: Early Outdoor Sowings {#march}

March is the first month you can sow directly outdoors in most of Europe, with protection.

Sow directly outside (with fleece/cloche):
– Radishes (fastest crop: 25 days from sow to harvest)
– Spinach (hardy, tolerates light frost)
– Rocket/arugula (bolt-resistant in cool conditions)
– Peas (direct sow against a trellis)

Continue indoors:
– Courgette/zucchini (4–6 weeks before last frost)
– Cucumber (needs warmth — windowsill only until May)
– Basil (needs consistent 18°C+ to germinate well)

First outdoor herbs to plant: chives, parsley, and mint in pots can go outside in March in most zones — they handle frost down to -5°C.

April: The Transition Month {#april}

April is the hardest month to manage on a balcony — days can hit 18°C then drop to 2°C at night. The risk of killing indoor-raised seedlings by moving them outside too quickly is highest in April.

Hardening off: Move tomato, pepper, and aubergine seedlings outside for increasing periods (2 hours → 4 hours → full day) over 7–10 days before leaving them out overnight. Cold shock sets plants back by 2–3 weeks — worse than just waiting.

Sow directly outside (no protection needed by late April):
– Lettuce (multiple varieties, stagger every 2 weeks)
– Spring onions/scallions
– Beetroot
– Climbing beans (late April, south-facing balconies only)

Harvest now (from overwintered plants): chives, rosemary, thyme, parsley — the perennial herbs that survived winter will be putting on fresh growth.

May: Main Outdoor Planting {#may}

After the last frost (typically early-to-mid May in zones 7–8), the main outdoor planting season opens.

Move outside permanently in May:
– Tomatoes (after hardening off, after last frost — wait for consistent nights above 10°C)
– Peppers and chillies (same frost rule as tomatoes)
– Aubergine (most frost-sensitive — don’t rush this one)
– Courgette (one plant per 40L container — they get enormous)
– Cucumber (trained up a trellis or hanging over a railing)

Direct sow in May:
– French/dwarf beans (very productive in containers)
– Marigolds (alongside tomatoes — repels whitefly)
– Second lettuce sowing
– Basil outdoors (once nights are reliably 12°C+)

May container tip: Group containers together in clusters — they create a microclimate where transpiration from nearby plants raises local humidity. Individual isolated pots dry out 40% faster in hot sun.

June: Succession Sowing {#june}

June is about preventing gaps. If you only sow once in spring, you’ll have a glut in July and nothing in September. Succession sowing — small amounts every 2–3 weeks — prevents this.

Sow for autumn harvest in June:
– Second courgette sowing (replaces first plant when it exhausts itself in August)
– Lettuce for August harvest (sow in partial shade — heat causes bolting)
– Climbing beans (second sowing)
– Pak choi and Asian greens (for September harvest)

Maintenance: Tomatoes need weekly side-shooting (removing the growth between main stem and leaf axil). Left unchecked, a cordon tomato plant becomes a bush that produces less fruit and is harder to manage on a small balcony.

July: Peak Season Management {#july}

July is full production. Harvesting regularly is now the primary job — leaving courgettes unharvested for a week produces 40cm marrows that drain energy from new fruiting.

Harvest daily or every other day:
– Courgette (at 12–15cm)
– Climbing beans (at 10–12cm before they become stringy)
– Tomatoes (when fully coloured — taste, don’t guess)
– Cucumbers (before they yellow)

Sow now for autumn:
– Kale (for September onwards)
– Chard/Swiss chard (tolerates light frost — will keep producing until November)
– Autumn lettuce varieties

July watering reality: In peak summer, small containers (under 20L) on a south-facing balcony may need watering twice daily. Terra cotta pots lose moisture fastest. Consider self-watering containers or a simple drip irrigation system connected to an outdoor tap timer (€20–€40, saves the season if you travel).

August: Second Season Begins {#august}

August is peak harvest and the start of second-season planting simultaneously.

What to sow in August:
– Pak choi (ready in 6 weeks — perfect for October harvest)
– Spring cabbage (for overwintering and spring harvest)
– Winter salads: corn salad, lamb’s lettuce, mustard greens
– Endive and chicory (bitter, hardy, productive in autumn)

Sow final succession crops:
– Radishes (30 days to harvest — fit in 3 more batches before frost)
– Spinach (bolt-resistant in cooler August conditions)

End of season tomato tip: Pinch out all new growth on tomato plants from mid-August. The plant has 6–8 weeks before frost — it should put energy into ripening existing fruit, not producing new trusses that won’t have time to mature.

September: Autumn Planting {#september}

September is garlic month, and the most important container task of the year.

Plant in September:
– Garlic (individual cloves, 5cm deep, 15cm apart, deep containers 25cm+)
– Spring bulbs for balcony colour (tulips, alliums, dwarf daffodils)
– Overwintering onion sets

Harvest and preserve:
– Dry chillies for winter use (string on thread and hang in a dry corner)
– Preserve excess tomatoes (sauce, passata, whole in brine)

Container preparation: As summer plants finish, empty and scrub containers with a 10% bleach solution. Diseased soil from a sick plant can infect next year’s crops if reused. Fresh potting mix every 2 years for intensively used containers.

October: Harvest and Wind Down {#october}

Last harvests:
– Clear tomato plants before first sustained frost — green tomatoes ripen on a windowsill at room temperature
– Harvest all chillies before frost (they store dried for months)
– Dig any root vegetables from deep containers

Protect what remains:
– Hardy herbs (rosemary, thyme, sage) stay outside year-round in zones 7+
– Tender herbs (basil) must come inside before first frost — one cold night kills basil
– Kale and chard survive frost down to -5°C — leave them outside under fleece

Container storage: Move terracotta pots indoors or wrap with bubble wrap. The freeze-thaw cycle cracks unglazed terracotta — even expensive ones. Plastic and glazed ceramic containers are fine outside through winter.

November–December: Winter Growing {#november-december}

The outdoor season is over, but indoor growing continues through winter.

Grow indoors year-round:
– Microgreens on a windowsill or under a basic LED (7–14 day cycle)
– Windowsill herbs: mint, chives, parsley transferred from outdoor pots
– Forced bulbs: hyacinths in glass vases, paperwhite narcissus (both ready in 8–10 weeks)

December planning tasks:
– Review what worked and what failed in 2026 — write it down, memory is unreliable
– Order new seeds now (catalogue varieties sell out faster every year)
– Clean and store all containers with diluted bleach to prevent disease carryover
– Assess which containers need replacing before the new season

My Experience: What Actually Worked in 2025 {#my-experience}

My balcony is 1.8m × 3.2m, west-facing, 4th floor, zone 7b. I ran 14 containers in 2025.

The specific successes:

‘Tumbling Tom’ cherry tomatoes in a 25L hanging container: 340 tomatoes counted over 10 weeks (mid-July to late September). No staking required, no side-shooting because it’s a determinate variety. First fruit 14th July, last harvest 22nd September before I cleared the plant. This variety is specifically bred for containers and it shows — I got better results from this in a 25L container than from a cordon variety in a 40L pot.

Succession lettuce worked better than I expected: I sowed every 3 weeks from March through July. At peak production in May and June, I was cutting salad 3 times per week and never ran out. The gap came in August — the July sowing bolted in the heat. In 2026 I’ll move the July sowing into partial shade.

The failures:

Courgette in a 20L pot: underwhelming. The plant produced 6 courgettes then stopped — root-bound. Courgettes need at minimum 35–40L per plant, and I learned that the hard way. In 2025 I moved the courgette to a 40L container and production increased to 3–4 courgettes per week.

Garlic planted in October (too late for my zone): the bulbs formed but remained undersized. September planting gives garlic an extra 4–6 weeks of root development before winter dormancy — that extra time shows in bulb size at harvest.

The unexpected winner: climbing beans on a bamboo trellis attached to the railing. Three plants in a 30L container produced a continuous harvest from June through August. I underplanted with basil (same container), which stayed compact under the bean canopy and suffered less in the afternoon heat.

For related reading on balcony soil and containers, see our guides on balcony containers and drainage and south vs north-facing balcony plants.

Quick-Reference Summary Table {#summary-table}

Safety Disclaimer

When using pesticides or pest control products on balcony food crops, choose products approved for edible plants and observe the harvest interval on the label (days between application and safe harvest). Organic options — neem oil, insecticidal soap — are effective for most common balcony pests (aphids, whitefly) without a harvest interval. Do not use systemic insecticides on flowering food plants — they affect pollinators visiting the flowers.

FAQ

What is the easiest vegetable to grow on a balcony?
Radishes (ready in 25 days), lettuce (cut-and-come-again in 30 days), and cherry tomatoes from compact determinate varieties. Radishes are genuinely foolproof — germination is reliable, pests rarely bother them, and the quick turnaround gives you feedback fast.

When should I start tomato seeds for a balcony?
Mid-January to mid-February, depending on your last frost date. Count backwards 10–12 weeks from when you can safely leave tomatoes outside overnight (typically mid-May in zone 7). Starting earlier produces oversized, root-bound plants by transplant time.

Can I grow vegetables on a north-facing balcony?
Yes, with the right crops. Lettuce, spinach, kale, rocket, mint, chives, and parsley all grow well with 3–4 hours of indirect light. Avoid tomatoes, peppers, courgette, and basil — they need 6+ hours of direct sun for reliable production.

How many pots do I need for a productive balcony garden?
Five to eight large containers (30–40L each) can run a productive year-round garden. Prioritise: one large container for tomatoes, one wide shallow tray for salad succession, two to three medium pots for herbs, one deep container for garlic or root vegetables.

What happens if I plant tomatoes too early?
Cold shock — nights below 10°C — causes tomato plants to stall. The leaves turn purple (phosphorus lockout in cold soil), flowering is delayed, and fruit set is reduced. Plants that go out in cold conditions often don’t catch up with plants put out 2 weeks later in correct temperatures.

How often do I need to water in summer?
In peak summer heat (25°C+), a 20L container in direct sun may need watering every day or twice daily. Check by pushing a finger 3–4cm into the soil — if it’s dry at that depth, water thoroughly until it runs from the drainage hole. Never just wet the surface.