Overwatering in cold weather greenhouses poses several risks, primarily due to reduced evaporation and slower plant growth in cooler temperatures. Excess moisture in the soil can lead to root rot, a condition where roots become waterlogged and unable to absorb nutrients properly, ultimately damaging the plant. High humidity levels, combined with overwatering, can also promote the growth of mold and mildew
Mold growth can affect both plants and the greenhouse structure itself. Wet conditions create an ideal environment for fungal infections and other diseases that thrive in damp, stagnant air. Overwatering can also cause a decrease in oxygen levels in the soil, stressing the plants and hindering their growth.
