Cold weather can arrive quickly in LaPorte, Indiana, making greenhouse preparation an important part of protecting plants, equipment, and next season’s production. A well-maintained structure retains heat more efficiently, handles winter weather better, and offers a cleaner environment for overwintering plants.
The process begins before the first hard freeze. Inspecting the building, servicing heating equipment, managing ventilation, and organizing plant material gives you time to correct small problems before they become costly emergencies.
Whether you operate a backyard greenhouse, a retail growing space, or a commercial structure, this seasonal checklist can help you work methodically. Angelo Bernacchi Greenhouse has served growers and gardeners since 1906, with a focus on dependable greenhouse products and customer service.
Walk around the entire greenhouse and look for damaged panels, loose glazing, cracked plastic, gaps around doors, and worn seals. Even a small opening can allow cold air and moisture inside, increasing heating costs and exposing plants to drafts. Tighten fasteners and replace damaged materials before winter weather arrives.
Clean the roof and sidewalls so maximum sunlight can enter during short winter days. Remove leaves, dirt, algae, and debris from the covering, gutters, and nearby ground. Check that snow and rain can drain away from the foundation rather than collecting beside the structure.
Examine benches, shelving, hanging systems, and floor surfaces as well. Heavy snow, ice, and saturated soil can place additional strain on the building. Remove unstable items and repair anything that could collapse or obstruct pathways.
Test the heating system well before temperatures fall below freezing. Clean burners, filters, vents, and intake areas according to the manufacturer’s instructions. A professional inspection may be appropriate for fuel-burning heaters, especially when combustion gases could enter the growing area.
Use a reliable greenhouse thermostat and place it where it reflects the general plant environment, away from direct heat, doors, or cold exterior walls. Consider a second thermometer at plant level to identify cold spots. Remote temperature alerts can provide valuable warning if power fails or a heater stops working overnight.
Inspect extension cords, outlets, power strips, and light fixtures for moisture damage or frayed wiring. Keep electrical connections elevated and protected from irrigation water. Commercial growers can also review wholesale greenhouse services when planning larger seasonal supply needs.
Winter insulation can reduce heat loss through walls, doors, and roof areas without blocking essential sunlight. Use materials designed for greenhouse applications and install them securely so they do not flap against panels or interfere with vents. Seal drafts around doors while keeping an easy-to-use entry system for daily access.
Ventilation remains important during cold weather. Open roof vents or side vents briefly on sunny days to release excess heat and humidity, then close them before temperatures drop. Stale, damp air encourages fungal disease, condensation, and plant stress.
Avoid watering late in the day unless plant needs require it. Allow foliage and walkways to dry before nighttime, and space plants so air can circulate around leaves. A small circulation fan can help reduce stagnant pockets, though it should not blow directly on tender plants for long periods.
| Area to Check | Winter Preparation | Warning Sign |
|---|---|---|
| Covering | Clean, repair, and secure panels or plastic | Drafts, cracks, or loose edges |
| Heating | Test, clean, and monitor the heater | Uneven temperatures or unusual odors |
| Ventilation | Confirm vents open and close properly | Heavy condensation |
| Irrigation | Drain exposed lines and protect valves | Frozen fittings or leaks |
| Plants | Group by temperature and light needs | Wilting, mold, or yellowing leaves |
| Safety | Check cords, alarms, and access paths | Tripping hazards or blocked exits |
Decide which plants will remain in the greenhouse, which require extra insulation, and which should be moved indoors. Tender perennials, tropical specimens, young starts, and recently propagated plants generally need warmer conditions than dormant hardy plants. Grouping plants by temperature requirements makes daily care more efficient.
Before bringing plants inside, inspect them for insects, disease, and damaged growth. Isolate questionable specimens and remove dead leaves from the greenhouse floor. Clean containers, tools, and trays to reduce the chance of carrying pests into a protected winter environment.
For detailed guidance on protecting sensitive plants in an unheated or lightly heated structure, review this overwintering guide. Adjust watering and temperature expectations according to each plant’s dormancy cycle rather than treating every crop the same way.
Drain outdoor hoses, exposed irrigation lines, filters, and backflow devices before freezing temperatures arrive. Water trapped in fittings can expand and cause cracks that remain unnoticed until spring. Insulate vulnerable pipes or relocate them to a warmer area when draining is not possible.
Clean and store hand tools after removing soil and plant residue. Sharpen pruners, disinfect cutting surfaces, and apply a light protective coating to metal parts. Organize pots, trays, soil amendments, labels, and row covers so winter maintenance does not require searching through clutter.
Keep fertilizers, pesticides, and other materials within their recommended storage temperatures. Some products can separate, freeze, or lose effectiveness in an unheated shed. Follow label instructions and keep all chemicals away from heat sources, children, and pets.
A greenhouse winter checklist works best when it becomes a regular schedule. Record interior and exterior temperatures, inspect plants for pests, check soil moisture, and verify that heating and ventilation equipment are operating correctly. Daily checks are especially important during severe weather or extended power outages.
Clear snow from the greenhouse roof when it becomes heavy, using tools that will not puncture or scratch the covering. Avoid standing beneath areas with accumulated ice, and keep entrances and emergency access routes clear. After a storm, inspect the structure for shifting, sagging, or water intrusion.
Use these recommendations to keep seasonal maintenance consistent:
Preparing your greenhouse for winter takes careful attention, but a planned inspection is easier than an emergency repair during freezing weather. Visit Angelo Bernacchi Greenhouse for dependable greenhouse resources and seasonal support, then complete your checklist before the next hard freeze arrives.