Seasonal Planting Calendar for Container Herbs on a Balcony
For container herbs on a balcony in central Russia, including Moscow and St Petersburg, the planting window usually runs from late April to early June. The timing depends less on the calendar month than on your last spring frost. Cool-season herbs such as parsley, cilantro and chives can go outside first, while basil and other frost-tender herbs wait until nights stay warm. The calendar below is built around the last frost date, so you can adapt it to any year.
How a Herb Planting Calendar Works
A herb planting calendar is a timeline showing when to sow seed, transplant seedlings, make successive sowings and bring plants in for winter. Each step is tied to a reference point, usually the average last spring frost. Local weather records and regional gardening guides list this date, and it is more reliable than a fixed month because spring can arrive early or late from one year to the next.
Balcony conditions can differ from street-level conditions. Walls and railings can warm or shelter a spot, while wind on an upper floor can make it colder. Observe your balcony for a few days before moving tender plants outside.
Choosing Herbs for Your Balcony
Start with four constraints: sunlight, wind, space and what you actually cook. Herbs that suit your conditions need less rescuing later.
Sunlight
Most culinary herbs need at least six hours of direct sun per day to produce dense growth and strong flavour. Parsley, chives, mint and cilantro tolerate partial shade, roughly four hours of direct sun, though they grow more slowly there. A north-facing balcony, or one shaded by a building opposite, usually suits only the shade-tolerant herbs.
Wind Exposure
Wind on an upper balcony dries soil and leaves quickly and can break tall, thin stems. Dill, fennel and lovage grow tall and need heavier pots or sheltered positions. Low, compact herbs such as thyme and oregano handle wind better, so place taller herbs behind shorter ones or against a solid wall where the wind is weaker.
Space and Container Size
Choose containers by root depth and final height. Basil and parsley need pots at least 20 cm wide and deep. Thyme, chives and oregano manage in about 15 cm. Dill and fennel need around 30 cm of depth because of their taproots and height. A pot that is too small dries out quickly on a warm day, so container size also affects watering.
Cooking Needs
Grow the herbs you use every week rather than every herb in a catalogue. Parsley, chives and basil are used often in many kitchens. Thyme and oregano keep well in small pots. Mint suits tea and salads but must be grown alone. Cilantro is worth sowing in succession because it bolts, flowers and loses leaf flavour in heat.
| Herb | Sun needed | Minimum pot depth | Moisture preference | Winter hardiness in central Russia |
|---|---|---|---|---|
| Basil | 6+ hours direct sun | 20 cm | Evenly moist | Tender annual |
| Parsley | 4–6 hours | 20 cm | Evenly moist | Hardy biennial, often grown as an annual |
| Cilantro | 4–6 hours, shade in heat | 15–20 cm | Evenly moist | Annual |
| Dill | 6+ hours | 30 cm | Moderate | Annual |
| Chives | 4–6 hours | 15 cm | Moderate | Hardy perennial |
| Mint | 4–6 hours | 20 cm | Consistently moist | Hardy perennial, spreads |
| Thyme | 6+ hours | 15 cm | Dries out between waterings | Hardy perennial; pot roots need protection |
| Oregano | 6+ hours | 15–20 cm | Dries out between waterings | Hardy perennial; pot roots need protection |
| Rosemary | 6+ hours | 30 cm | Dries out between waterings | Tender; move indoors for winter |
Container Size, Drainage and Potting Mix
Healthy roots need air as well as water. Every container needs drainage holes. Without them, water collects at the bottom, pushes out air and causes root rot, even when the surface looks dry. If you prefer decorative pots without holes, keep the herb in a plastic nursery pot inside the decorative one and empty any standing water after watering.
Use a multipurpose potting mix, peat-based or peat-free, rather than garden soil, which compacts in containers and drains poorly. For Mediterranean herbs such as thyme, rosemary, sage and oregano, mix in a large share of grit or perlite, often around a third by volume, so water drains quickly and roots do not sit in wet mix. Mint, parsley and basil do well in a richer mix that holds moisture.
The pot material also changes watering. Unglazed terracotta loses water through its walls and dries faster than glazed ceramic or plastic.
Watering by Soil Moisture, Not by Schedule
Water when the soil needs it, which depends on the weather, the herb and the pot, not on a fixed day of the week. Push a finger 2–3 cm (about 1 inch) into the mix. If it feels dry, water thoroughly until water runs out of the drainage holes. If it feels damp, wait. Lifting the pot also helps: a dry pot feels noticeably lighter than one that was just watered.
Weather changes how fast soil dries. Hot, windy days on a sunny balcony can dry a small pot within a day, while cool, overcast weather can leave it damp for several days. Rain may not reach a pot under an overhang, so check it even after a shower.
A fixed schedule ignores the factors that drive water use: light, heat, wind and leaf area. Too much water causes yellowing and rot. Too little causes wilting and crisp, browned leaf edges.
Why Herbs With Different Moisture Needs Need Separate Pots
Mint, parsley and basil prefer soil that stays evenly moist. Thyme, rosemary, sage and oregano prefer to dry out between waterings and rot in soggy mix. Chives fall in between. If you plant thyme and basil in the same pot, one of them will be watered to suit the other, and usually the thyme suffers. Mint also spreads by underground runners and crowds out neighbours, so it needs a pot of its own.
Feeding, Pruning and Harvesting
Feeding
Fresh potting mix contains some nutrients, but in a pot they run out within a few weeks. For leafy annuals such as basil, parsley and cilantro, apply a balanced liquid fertiliser at half the label strength every two to three weeks during active growth. Mediterranean herbs need less. Overfeeding produces lush, watery growth with weaker flavour. Reduce or stop feeding in late summer so perennials slow their growth before winter.
Pruning
Pinch basil just above a pair of leaves. This makes the plant branch and grow bushy instead of tall and single-stemmed. Remove flower buds as they form, because flowering diverts energy into seed production and leaves tend to become less flavourful. Trim chives to about 5 cm above the soil. Trim rosemary and thyme lightly, mostly the soft tips, because cutting into old, bare wood often does not regrow.
Harvesting
Take no more than about a third of a plant at one time so it keeps enough leaf area to keep growing. Frequent light harvests keep herbs compact and productive. If a herb is left unharvested, it tends to flower and stop producing new leaves. Cut cilantro outer leaves first, and harvest oregano before it flowers for the strongest flavour.
Common Care Problems and What They Mean
Most herb problems show up in the leaves first. Match the symptom to its likely cause before changing your routine, since overwatering and underwatering can look similar.
| Symptom | Likely cause | What to do |
|---|---|---|
| Pale, stretched stems with wide gaps | Too little light | Move to the sunniest spot, rotate pots regularly and pinch back growth |
| Yellow lower leaves, soggy soil, sour smell | Overwatering or poor drainage | Stop watering, check the drainage holes and repot into a gritty mix if roots are rotting |
| Crisp, brown leaf edges, drooping in the afternoon | Underwatering or wind damage | Water thoroughly, move out of the strongest wind and check that the pot is large enough |
| White powder on basil leaves | Powdery mildew in still, humid air | Water at the base, give plants more space and remove affected leaves |
| Cilantro sends up flower stalks early | Heat and long days | Harvest leaves promptly, sow in smaller batches and provide afternoon shade |
| Clusters of small insects on new shoots | Aphids | Rinse off with a strong jet of water, check leaf undersides and repeat as needed |
| Woody, sparse rosemary or thyme | Old growth, low light or lack of trimming | Trim soft tips in spring, repot with fresh mix and expect slow regrowth |
The Herb Planting Calendar
Use the last spring frost as the reference point. In Moscow and St Petersburg, last frosts usually fall in May, and first autumn frosts usually come in late September or October, but check the records for your area. The table gives timing relative to that frost, with approximate months for these cities. If you are asking what to plant right now, find the row for your herb and check where the current date falls. A printed copy of the table works well as a planting calendar kept near your seed packets.
USDA hardiness zone 6 is a North American scale with an average winter minimum of −23 to −18 °C. Use it only as a rough guide to cold tolerance. Your local frost dates and the winter lows on your own balcony are more useful for planning.
| Herb | Sow indoors | Sow or plant outdoors | Succession sowing and harvest | Overwintering |
|---|---|---|---|---|
| Basil | 4–6 weeks before last frost (late March to early April) | Plant out once nights stay above about 10 °C (late May to early June) | Pinch every 2–3 weeks through summer | Not hardy; treat as an annual |
| Parsley | Not needed | Sow 2–4 weeks before last frost (late April to early May); germination can take 2–4 weeks | Harvest outer stems; sow again in late summer for autumn leaves | Hardy biennial; protect the pot in winter |
| Cilantro | Not recommended | Sow directly 2–4 weeks before last frost | Sow every 2–3 weeks until heat arrives; harvest leaves before flowering | Annual |
| Dill | Not recommended; taproot dislikes transplanting | Sow directly after last frost (around mid-May) | Sow every 3–4 weeks in early summer | Annual; let a few plants seed if you want seed for next year |
| Chives | Not needed | Plant divisions or nursery plants 2–4 weeks before last frost | Cut from spring onward, leaving a short stub | Hardy perennial; protect pot roots |
| Mint | Not needed | Plant after last frost, in its own pot | Harvest often to keep it bushy | Hardy perennial |
| Thyme and oregano | Not needed | Plant after last frost | Harvest tips; trim lightly after flowering | Hardy perennials; protect pot roots |
| Rosemary | Not needed | Plant after last frost | Light trims during the season | Bring indoors before first frost |
Month-by-Month Summary for Moscow and St Petersburg
- March to early April: Start basil indoors. Plan the balcony layout and pot sizes.
- Late April to early May: Sow parsley and cilantro outdoors. Plant chives.
- Mid-May: Sow dill directly once frost risk has passed.
- Late May to early June: Plant out basil, mint, thyme, oregano and rosemary after the last frost.
- June to August: Make successive sowings of cilantro and dill, pinch basil and keep soil moisture checked.
- September: Finish harvesting annuals, reduce feeding and let perennials slow down.
- October to November: Bring rosemary indoors before the first frost and protect hardy pots.
Overwintering Herbs on a Balcony
Container roots freeze more easily than roots in open ground, because the soil around them is thin and exposed on all sides. Hardy perennials such as chives, thyme, oregano and mint need protection in pots. Group the pots against a sheltered wall, away from the strongest wind. Wrap the sides with bubble wrap or burlap, raise the pots off a cold surface and add a layer of mulch on top of the soil.
Water sparingly in winter. Soggy, cold soil is more likely to cause root damage than dry soil. Water only when the root ball is dry and the weather is above freezing.
Tender herbs such as rosemary need a different approach. Bring them indoors before the first frost and place them in a cool, bright spot, roughly 5–10 °C. Annuals such as basil, cilantro and dill finish their cycle in autumn. If you want seed for next year, leave a few dill or cilantro plants to flower and collect the seed when it dries.
Planning a Small Balcony
A small balcony rewards a short, realistic list. Plant three to five herbs that you cook with every week, such as basil, parsley, chives and thyme. Group them by moisture need: basil and parsley in one pot, thyme and oregano in another, and mint alone.
- Use wall-mounted or railing planters for thyme and chives to free floor space, and check that any railing planter is secure and not too heavy for the railing.
- Skip dill and fennel on very small balconies, since their height and taproots need deep, stable containers.
- Buy nursery seedlings of basil and rosemary to skip the indoor sowing stage.
- Start with one container per herb, and add more only after you have seen how each one grows in your conditions.