Seeds are very sensitive to the extremes of over watering and under watering. Excessive water and poor air circulation will cause a fungal infection often referred to as damping-off. Cover trays with plastic wrap to keep the moisture level constant. In addition, heavy-handed watering can disturb newly germinated seedlings. Securing plastic wrap over the surface of a freshly sown seed pot can help to keep the moisture level constant. However, the pot must still be checked daily for moisture and germination.