Stock · Sosnovyy Bor, Leningradskaya Oblast', Russia
When to plant stocks in Sosnovyy Bor
Main outdoor window
20 Apr - 11 May
A climate estimate. Check your soil, forecast and cultivar.
Timed from last spring frost
4 May
In Sosnovyy Bor, on your chosen risk.
First flowers
9 Jul - 8 Aug
If you plant at the start of the window.
The average last frost. Half of all years are later than this.
Step by step in Sosnovyy Bor
Download these planting dates (.ics)
Import into Apple Calendar, Google Calendar or Outlook. Dates use the selected risk level and are planning estimates, not frost alerts.
Each window is a planning range. Check the forecast, soil and cultivar before planting; a later date is not automatically safer in hot or wet conditions.
Start indoors
9-30 Mar
Eight weeks before your last frost, under cover or on a windowsill.
Plant out
20 Apr - 11 May
Two weeks before your last frost.
In flower
9 Jul - 8 Aug
Stocks through the year
Against the frost risk in Sosnovyy Bor
Seasonal context
Rainfall and the growing season in Sosnovyy Bor
August has the highest average precipitation (93 mm); February has the lowest (43 mm). Compare this pattern with the planting windows and your water supply.
During wetter months, check that beds and containers drain after heavy rain. During drier months, plan how you will keep seeds and new transplants watered. Monthly averages can hide long dry spells and intense storms; they do not show soil moisture, humidity or this week's weather.
Source: NASA POWER, corrected MERRA-2 precipitation, 2001–2020. Values are approximate monthly totals, including the water equivalent of snow, from the nearest 0.5° × 0.625° grid cell. This reference period differs from the temperature record. Rainfall provides context and does not change the calculated planting dates. Method and limitations.
Monthly growing conditions in Sosnovyy Bor
Compare the planting window with the local temperature pattern. These are historical monthly averages, not this year's forecast or measured soil temperatures. Average frost days do not tell you whether a particular night will freeze.
| Month | Average low | Average high | Frost days |
|---|---|---|---|
| January | -9.2°C (15.4°F)15.4°F (-9.2°C) | -5°C (23°F)23°F (-5°C) | 29.5 |
| February | -9.5°C (14.9°F)14.9°F (-9.5°C) | -4.6°C (23.7°F)23.7°F (-4.6°C) | 27.1 |
| March | -5.8°C (21.6°F)21.6°F (-5.8°C) | -0.6°C (31°F)31°F (-0.6°C) | 29.1 |
| April | -0.2°C (31.7°F)31.7°F (-0.2°C) | 6.4°C (43.6°F)43.6°F (6.4°C) | 15.7 |
| May | 5.6°C (42°F)42°F (5.6°C) | 13°C (55.4°F)55.4°F (13°C) | 1.6 |
| June | 11.2°C (52.2°F)52.2°F (11.2°C) | 17.9°C (64.2°F)64.2°F (17.9°C) | 0.0 |
| July | 14.5°C (58°F)58°F (14.5°C) | 20.7°C (69.3°F)69.3°F (20.7°C) | 0.0 |
| August | 13.6°C (56.5°F)56.5°F (13.6°C) | 19.7°C (67.5°F)67.5°F (19.7°C) | 0.0 |
| September | 9.2°C (48.6°F)48.6°F (9.2°C) | 14.7°C (58.5°F)58.5°F (14.7°C) | 0.0 |
| October | 3.8°C (38.8°F)38.8°F (3.8°C) | 7.6°C (45.7°F)45.7°F (7.6°C) | 5.0 |
| November | -1.6°C (29.2°F)29.2°F (-1.6°C) | 1.5°C (34.6°F)34.6°F (1.5°C) | 17.9 |
| December | -6.2°C (20.8°F)20.8°F (-6.2°C) | -2.6°C (27.3°F)27.3°F (-2.6°C) | 27.1 |
For stocks, also check drainage, sunlight and cultivar requirements. See the rainfall context above; humidity, irrigation and local pest pressure are not calculated.
Local growing check
Before choosing stocks for Sosnovyy Bor
- August is the wettest month in the rainfall grid, averaging about 93 mm. Check how your own bed drains and plan watering around actual soil moisture; monthly rain totals are not an irrigation schedule.
The temperature and rainfall tables on this page show the underlying climate estimates. How these suitability checks work · Record what happens in your garden.
Before you plant stocks
Use the calendar to plan ahead, then check the conditions in your own garden.
- Frost tolerance does not make saturated or frozen soil suitable for planting. Wait until the bed can be worked without smearing or compacting it.
- Harden off plants raised indoors: gradually expose them to outdoor light, wind and temperature before their final move into the bed.
- Use the maturity range on your seed packet when choosing a variety. Cold, short days and transplant stress can make harvest later than the calendar estimate.
Choose stock for a cool flowering season and the right stem type
Use fertile, drained soil and a bright position during a suitable cool growing period. Keep moisture available without waterlogging roots. Sustained heat, particularly warm nights, can shorten the useful display, so a frost-free date alone does not prove suitability.
Compare small sowing batches if a longer supply of flowers is wanted. Record the strain, sowing date and first usable stem rather than mixing results from branching and single-stem types. If hot conditions end the display, investigate a cooler planting season before adding more fertiliser.
What to record this season
Which strain and sowing batch gave useful flowers before sustained heat arrived? Add the cultivar, sowing date and conditions to your growing record so you can compare next season.
Further reading: NC State Extension: Matthiola incana . General crop guidance; local dates on this site are calculated separately. Source checked 19 September 2026 by Safe to Plant; this is not an expert review.
The reference describes plant identity and cultivation. Its regional calendar months and hardiness observations do not validate the calculated dates for another location.
How the dates are calculated and their limits · Keep a growing record · Report a local discrepancy
Why these dates
Use fertile, drained soil and a bright position during a suitable cool growing period. Keep moisture available without waterlogging roots. Sustained heat, particularly warm nights, can shorten the useful display, so a frost-free date alone does not prove suitability.
Check the named variety and local forecast before exposing young growth. The catalog cold-damage figure is a reference, not a guarantee: plant age, acclimatisation, wind and the duration of a freeze affect damage.
This calendar uses frost-relative offsets as a starting point. Stocks are timed from 8 weeks before that frost for an indoor start, with planting out 2 weeks before it, and this page simply resolves those offsets against the frost date computed for Sosnovyy Bor.
Sosnovyy Bor is zone 6a, within the crop's general range. This is an initial cold-hardiness check; cultivar, exposure, drainage and unusual winters can still change the outcome.
The median frost-free season here is 171 days, against 80 to 110 days to first flower for this crop counted from planting out. That margin is what decides whether a late sowing is worth attempting.
Also in Sosnovyy Bor
Other flowers to time
Growing stocks in Sosnovyy Bor
Can I grow stocks in Sosnovyy Bor?
The calendar estimates a planting window, not a guarantee of success. August is the wettest month in the rainfall grid, averaging about 93 mm. Check how your own bed drains and plan watering around actual soil moisture; monthly rain totals are not an irrigation schedule.
When should I plant stocks in Sosnovyy Bor?
Aim for 20 Apr - 11 May in an average year. If you would rather not gamble on the weather, wait until 30 Apr - 21 May - by then frost has finished in nine years out of ten.
When might stocks flower in Sosnovyy Bor?
The estimated period is 9 Jul - 8 Aug, based on 80 to 110 days from the modeled planting date. Cultivar, planting material and growing conditions can change this interval; check the plant as well as the calendar.
How much frost will stocks tolerate?
Check the named variety and local forecast before exposing young growth. The catalog cold-damage figure is a reference, not a guarantee: plant age, acclimatisation, wind and the duration of a freeze affect damage.