January frost-tender indoors: container and Mediterranean plants

TL;DR

January is the month to bring frost-tender plants indoors. Mediterranean plants, exotic container plants and tender perennials cannot survive hard winter outdoors. This includes olives, citrus, bougainvillea, date palms, agave and many herbs. Move them to a light, cool indoor space (10-15°C) and do not forget to water. They need less water than in summer, but not bone dry. On gardenworld.app we help you plan which plants grow outdoors and which overwinter indoors.

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Why January is urgent for frost-tender plants

January is usually the coldest month. Temperatures drop to -5°C or lower, and extended freeze can occur. Many Mediterranean and tropical plants cannot survive this. If you wait until February and a hard frost comes, your investments can freeze to death.

January is therefore urgent: check what you still have outside and what must come in. This is better than rushing in December for holidays or waiting until February and then being too late.

Which plants must you bring in January?

Citrus plants (lemon, orange, kumquat): Very frost-tender. Temperature below 5°C damages them. These definitely come inside.

Olive trees: Can tolerate light frost (to -5°C), but prolonged frost (weeks on end) damages them. Better inside in January.

Bougainvillea, bougainvillea, bougainvillea: Tropical climber/shrub. Even light frost is deadly. Absolutely indoors.

Agave, aloe, succulents: Many succulents are from warm, dry climates. They cannot tolerate frost. Indoors.

Date palms, other palms: Depends on type. Small palms indoors. Hardy palms (Phoenix canariensis) tolerate light frost but prefer indoors.

Exotic herbs: Rosemary (hardy), lavender (hardy), but mint, basil, oregano (tender)? Mint indoors. Basil: absolutely.

Geranium, fuchsia: Tender, come indoors.

Hibiscus: Tropical, very frost-tender. Indoors.

Lantana: Can tolerate several degrees of frost, but January frost? Better indoors for safety.

Unsure? Bring it in. The worst outcome is your plant stays indoors slightly too long. Worse is you freeze it.

How to bring them safely indoors?

Check for pests first. Before bringing the plant in, check for caterpillars, aphids, spider mites. A pest-infested plant indoors spreads them everywhere. Spray lightly if needed.

Adjust light gradually. Moving from bright outdoor light to dimmer indoors can shock the plant. Put it first in a spot with indirect light, not deep shade.

Water well before moving. Give a thorough watering before bringing it indoors.

Ensure good drainage. Check the pot has holes. Indoor air is drier, plants evaporate less, so they rot more easily.

The ideal overwintering spot at home

Temperature: 10-15°C is ideal. Not too warm (plant would still grow), not too cold (would freeze).

Light: As much as possible. A sunny south-facing window is best. Without good light, they grow poorly and become tall and spindly.

Ventilation: Ventilate regularly. Stale air leads to mold.

Soil check: Indoor air is dry. Check soil: if it feels dry 2 cm below the surface, water. Don't water every day (many plants enter dormancy in January).

Water and feeding in January

Water: A frost-tender plant in dormancy (January-February) needs much less water. Check the soil. Water only if it feels dry, not if moist.

Feeding: No fertilizer in January-March. The plant is dormant and cannot use it.

Humidity: Indoor heating dries air. For tender plants (bougainvillea, hibiscus), you can mist regularly with water to raise humidity.

When to move them back outdoors?

Not too early! One frost-free spell in March does not mean safe. Wait until end of April / early May:

• No more night frost
• Ground has warmed
• Plant is actively growing

Harden off: put them outside during the day (probably April) and back inside at night for a few weeks. This accustoms them to sun.

Frequently asked questions

Can I overwinter them in an unheated cellar?

Depends on temperature. Below 5°C: No for citrus and Mediterranean. 5-10°C: Cautiously, check regularly. They also need light - a dark cellar does not work well.

How much water to give when indoors?

Check weekly. Feel 2 cm below soil. Dry = water. Moist = no water. Generally much less than outdoors.

My plant is dropping leaves indoors. Is this bad?

Partial leaf drop in January-February is normal for many Mediterranean plants. This is their dormancy. As long as stems stay green, it is alive. Don't worry.

Can I keep them in darkness to save energy?

Bad idea. Plants need light. Without light, they grow poorly and can die. Put them in the brightest spot available.

Step-by-step

Step 1: Inventory your plants

Walk your garden. Note which frost-tender plants are outside.

Step 2: Check for pests

Before bringing them in, inspect for insects and mold. Spray if needed.

Step 3: Prepare indoors

Set aside space for your plants. Sunny window or spot with good indirect light.

Step 4: Bring inside

Water well first. Place in bright light. Adjust temperature gradually.

Frequently asked questions

What do I do with large olive trees?

If it is too large to move indoors, protect it outdoors. Wrap in burlap, erect windscreen, place against wall (absorbs heat). Smaller specimens: indoors.

Do I need to bring every plant in?

No. Hardy Mediterranean plants (rosemary, lavender) stay outdoors. Tender-to-frost-tender: indoors. Ask the plant seller or check online.

How much light per day?

Ideal: 6-8 hours of direct light daily. Less? It survives, but grows slowly with less vigor.

Plan your overwintering

Hundreds of gardens are already designed on [gardenworld.app](https://gardenworld.app). Upload your front yard photo, choose your style, and see within 1 minute how your frost-tender plants fit. Free first design, no credit card needed.