Why Light Is Critical for Healthy Seedling Development


Next to moisture content and temperature, light levels are critical for the development of healthy new seedlings.

Once germinated seeds begin to penetrate the soil, place them under bright light.

This will ensure stalky and robust stems instead of fragile and stretchy ones. Thin stems are also more susceptible to disease attack (called “damping off’) because they are tender and near moist soil.

Once attacked, stems begin to rot, and the seedling collapses.

This scenario can easily be prevented by providing at least 300 micromoles of light as soon as the seedling emerges. Plants stretch quickly at this stage, and waiting too long will result in undesirable growth.

Get a jump on the game and light your seed trays just before the plants emerge.