PlantyBoxAn Abnormal October: The Heat Numbers
The Copernicus Climate Change Service recorded the second-warmest September ever measured globally in 2026, with an anomaly of 1.63°C (2.93°F) above pre-industrial levels (Copernicus/LaPresse). In Europe it was the third-warmest September on record, with a land-surface average of 16.26°C (61.3°F), 1.54°C (2.77°F) above the 1991–2020 norm (Copernicus/Sky TG24).
The trend has carried into fall: in early October, temperatures stayed above average across much of Italy, with highs near 30°C (86°F) in north-central regions and Sardinia due to an African high-pressure system (Meteo.it, 3BMeteo). By mid-month the high pressure strengthened again, with 28°C (82°F) in Aosta and 27°C (81°F) between Sardinia and Sicily — numbers typical of September (Tempo Italia). Fall foliage in the Alps and foothills is also running 14-20 days behind schedule (Meteo Giornale).
Potting Mix Dries Out Faster Than You'd Expect
Containers hold a limited volume of soil, and with temperatures still elevated, evaporation remains high even in October. Summer's accumulated water stress doesn't simply resolve on its own: in Milan, for example, more leaves have dropped from summer drought than from the normal autumn process (Meteo Giornale).
Don't rely on the calendar — check the soil directly. Push a finger down 1-1.5 in (3-4 cm) or lift the pot to gauge its weight. A watering reminder tied to local weather forecasts, like the one offered by PlantyBox, can help you avoid skipping waterings on the hottest days.
- Check soil moisture every 2-3 days, not just once a week
- Water in early morning or evening, avoiding the hottest hours
- Add a light mulch layer (straw, shredded bark) to cut down evaporation
- Move smaller pots out of direct midday sun
Delayed Herbs: Hold Off on Pruning Rosemary and Sage
With temperatures running this high, rosemary, sage, and other Mediterranean herbs are staying in active growth longer and delaying dormancy. Pruning now, as you normally would in a typical October, risks triggering tender new shoots that won't have time to harden before the first real cold snap.
It's better to wait for concrete signs of slowing growth — fewer new leaves, slightly woodier stems — before doing your end-of-season pruning.
Asian Stink Bugs Still Active: What to Watch on Your Balcony
Emilia-Romagna's Plant Health Service reports that the brown marmorated stink bug (Halyomorpha halys) has entered its search for winter shelter: this behavior kicks in once daylight drops below 13.5 hours a day, regardless of temperature (Mediatime.net). In practice, even with the current heat, these insects keep moving toward shelter to overwinter, and balcony or patio containers can become a convenient stopover.
If you use traps or repellents, keep them out of reach of dogs and cats and away from food and water bowls. If you're unsure whether a product is toxic to pets, check its label before using it.
- Regularly inspect leaf undersides and branch joints
- Remove individual bugs by hand rather than crushing them near plants
- Seal gaps around windows and balcony doors where insects might shelter
- Avoid generic insecticides on balconies used by pets
An Extra Window for Lettuce and Radishes
Agronomists note that October is traditionally a good window for fast-cycle crops like lettuce and radishes, since the soil is still warm while cooler air slows fungi and pests (CasaDiStile.it). This year, though, persistent heat is throwing off that balance: temperatures that are too high can cause uneven germination and may require more frequent watering even for freshly sown seeds.
In containers, sow in narrow rows in shallow seed trays, and check surface moisture daily until seeds germinate.
FAQ
Should I keep watering my container garden even though it's October?
Yes — with temperatures still above average, potting mix dries out quickly. Check soil moisture every 2-3 days instead of following a seasonal schedule.
Why shouldn't I prune my rosemary and sage right now?
The unusual heat is extending these herbs' active growth; pruning now would trigger tender new shoots that may not harden off before the first real cold.
Are Asian stink bugs dangerous to pets?
The insect itself isn't toxic, but if you use traps or repellents against it, keep them away from dogs and cats and always check the product's pet-safety label before use.
Sources
- Copernicus, nel 2026 il secondo settembre più caldo mai registrato a livello globale
- Clima, Copernicus: nel 2026 il secondo settembre più caldo mai registrato
- Meteo ottobre, temperature sopra la media: ecco quando potrebbero tornare le piogge
- Ottobre anomalo: caldo e poca pioggia, ecco quando finirà
- Cimici asiatiche in casa col caldo di settembre: cosa le fa entrare adesso
