Domakihub How to Protect Plants from Frost and Keep Your Garden Safe
Practical frost-protection methods for gardens, terraces, and outdoor spaces in Greece.
Reviewed by Domakihub garden pros · 2026-06-23 · 5 min read
Even in Greece, night frosts in January and February can catch gardeners off guard — catching both homeowners and holiday-rental managers with tender plants that were never prepared. The video above demonstrates the full range of cold-protection techniques; the steps below translate those into a practical routine you can apply to any home, terrace, or hotel courtyard. A little preparation the evening before a frost is worth far more than costly replacements once the damage is done.
Why Frost Damages Plants
Frost forms when air temperature drops below 0 °C and water inside plant cells freezes. The ice crystals puncture cell walls, turning leaves mushy and stems black. The damage is often invisible at dawn but becomes clear as temperatures rise — which is why most gardeners underestimate the overnight risk.
Mediterranean gardens are not immune. Citrus trees, bougainvillea, basil, succulents, and potted herbs are all vulnerable to even a single hard frost. In exposed mountain locations, or during an unusual cold snap near the coast, temperatures can dip low enough to kill established shrubs that have thrived for years.
When to Start Preparing
The trigger to act is a weather forecast showing overnight lows at or below 2 °C — not 0 °C. Cold air settles and ground radiation can push the temperature at plant level several degrees below the official reading. In Greece, the risk window runs from mid-November through late February, with the sharpest frosts usually arriving in January during northerly Tramontana or Bora winds.
Check forecasts the day before, not the morning of. Most protection measures — wrapping, moving pots, mulching — work best when done a few hours before temperatures fall, not in a panic at midnight.
5 Steps to Protect Your Plants from Frost
- 1
Move potted plants indoors or into a sheltered corner
Containers are the most vulnerable plants in any garden because their roots have no soil mass to buffer temperature swings. Before a forecast frost, move pots against a south-facing wall, under a covered terrace, or into an unheated but sheltered room such as a garage or storage shed. Even reducing wind exposure and gaining two or three degrees of radiated wall heat can make the difference between survival and loss.
- 2
Water the soil thoroughly the evening before
Moist soil holds heat far better than dry soil — it releases stored warmth slowly through the night, raising the microclimate around the root zone by 1–2 °C. Water your beds and containers in the late afternoon on the day a frost is expected. Avoid watering the foliage itself, as wet leaves freeze faster than dry ones.
- 3
Mulch the root zone to insulate the soil
Spread a 5–10 cm layer of straw, shredded bark, dried leaves, or wood chips over the soil around vulnerable plants. Mulch acts as an insulating blanket that slows heat loss from the ground overnight. For established citrus trees, rosemary hedges, or oleanders, a thick mulch ring is often enough protection without any further wrapping.
- 4
Cover plants with frost fleece, old bedsheets, or hessian
Drape a breathable cover — purpose-made frost fleece is best, but old cotton bedsheets or hessian sacks work well — loosely over the plant before sunset. The cover traps ground heat and shields leaves from direct contact with freezing air. Avoid plastic sheeting directly on foliage; plastic conducts cold and can scorch leaves when the sun rises. Remove covers in the morning once temperatures are safely above 2 °C so plants can breathe.
- 5
Check and act again after the frost lifts — do not prune immediately
Once a frost has passed, resist the urge to cut back blackened stems straight away. Frost-damaged foliage looks alarming, but the plant may still be alive below the surface. Wait until new growth begins emerging — usually late February or March — and then prune back only to the point where green, living tissue appears. Pruning too early in winter can expose fresh wounds to a second frost and cause far more damage.
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FAQ
- Which plants need the most protection from frost in a Greek garden?
- Citrus trees (lemons, oranges, mandarins), bougainvillea, hibiscus, basil, succulents, and most tropical or sub-tropical potted plants are the most frost-sensitive. Olive trees and rosemary are generally hardy to around -8 °C once established, but young specimens in their first two winters should still be protected.
- Can I use bubble wrap or plastic sheeting to cover plants?
- Bubble wrap can be used around the outside of a pot to insulate the root zone, but it should not touch the foliage directly. Standard plastic sheeting traps moisture and can cause condensation freeze damage and fungal problems. Frost fleece (a white non-woven polypropylene fabric) is the safest and most reusable option for covering leaves and stems.
- How do I know if my plant has been killed by frost or just damaged?
- Scratch the bark or stem lightly with a fingernail. If the tissue beneath is green or cream-coloured and moist, the plant is alive. If it is brown, dry, and hollow, that section is dead. Work your way down the stem from the tip toward the base until you find live tissue — the plant can usually be pruned back to that point and will regrow in spring.