🌨️ Winter Greenhouse Tasks for UK Gardeners

🌸 Introduction: Why Winter Greenhouse Care Matters

A greenhouse is a lifeline during winter — protecting plants from frost, providing shelter for tender species, and giving you a space to prepare for spring. But to keep it functioning well through the coldest months, your greenhouse needs care and maintenance.

Winter greenhouse tasks help prevent:

• frost damage
• mould and fungal problems
• poor airflow
• heat loss
• condensation build-up
• pests hiding in corners
• weak winter crops

Looking after your greenhouse now ensures healthier plants and a strong start to the next growing season.

Below are the best products to help with winter greenhouse maintenance.

⭐ Check Out Our Recommended Products

• Bubble Wrap Insulation

Perfect for lining greenhouses to retain heat and reduce frost risk.
Click here to see them

• Paraffin or Electric Greenhouse Heaters

Ideal for maintaining safe nighttime temperatures.
Click here to see them

• Ventilation Tools & Thermometers

Help monitor humidity and prevent mould problems.
Click here to see them

❄️ Winter Greenhouse Tasks (Full Checklist)

Everything your greenhouse needs from December–February.

🌬 1. Insulate With Bubble Wrap

Line:

• walls
• roof panels
• doors

Bubble wrap traps heat and reduces heat loss at night.

🌡 2. Check and Maintain Heating

A heated greenhouse stays frost-free.

• paraffin heaters
• electric heaters
• soil-warming mats

Check thermostats and fuel levels.

🌧 3. Manage Condensation & Humidity

Winter humidity encourages:

• mould
• rot
• fungal diseases

Do this:

• ventilate on mild days
• avoid overwatering
• space plants apart
• tidy debris

🌱 4. Protect Tender Plants

Wintering plants like:

• pelargoniums
• fuchsias
• citrus
• herbs
• chillies

Protect with:

• fleece
• insulated pots
• raised shelving

🧼 5. Deep Clean Your Greenhouse

Clean now while plant numbers are low.

• wash panes
• clear algae
• scrub benches
• disinfect trays
• sweep floors

A clean greenhouse warms faster and prevents disease.

🪴 6. Start Early Sowing Preparation

Organise:

• seed packets
• seed trays
• pots
• propagation lids
• heat mats

January–February is prime time for early crops like chillies and onions.

🌿 7. Check for Pests & Hidden Problems

Winter pests hide in:

• corners
• under pots
• in compost bags
• on dirty trays

Look for aphids, whitefly, slugs, vine-weevils.

🌧 8. Water Carefully

Overwatering is the biggest winter greenhouse mistake.

Tips:

• only water when soil is dry
• water early in the day
• avoid splashing leaves
• check for cold-damaged roots

🧊 9. Prevent Freezing at Night

Even in greenhouses, temperatures can drop below zero.

Use:

• fleece layers
• heaters
• bubble wrap
• warm microclimates

📦 10. Store Compost Indoors

Cold compost is harder to warm and slows germination.

Keep compost bags:

• indoors
• in a shed
• in a frost-free corner

💡 Common Winter Greenhouse Problems

❌ Mould on compost

Reduce humidity and ventilate.

❌ Frozen pots

Raise pots or add insulation.

❌ Poor germination

Warm compost and add heat mats.

❌ Yellowing leaves

Overwatering or cold roots.

❌ Drooping plants

Lack of light or excessive humidity.

🌱 What to Expect in Early Spring

By March your greenhouse will be:

• warm and tidy
• stocked with seeds
• ready for sowing
• protected from frost
• free of pests
• prepared for vegetable starts

A well-maintained winter greenhouse grows stronger seedlings.

🌸 FAQs

Do I need to heat a greenhouse in winter?

Not always — but tender plants need protection.

Can I sow seeds in December?

Generally no — wait until January–February.

Is bubble wrap essential?

Yes — it can raise night temperatures by several degrees.

Why does my greenhouse get mouldy?

Humidity + low airflow = mould.

🌼 Conclusion

Winter greenhouse care keeps plants protected, reduces disease, and prepares you for early sowing. By insulating, heating, cleaning and planning now, your greenhouse will be a warm, productive haven ready for the year ahead.