Why your early spring seedlings need a warm start without any light at all
In short: Charles Dowding explains how to master early germination by separating heat needs from light requirements. Learn the critical moment to move your trays to ensure your seedlings grow strong, sturdy stems instead of thin, leggy ones.
Most seeds require warmth to germinate but do not need light during this initial phase. Dowding suggests starting trays inside a house where temperatures remain warmer at night compared to a greenhouse. Because light is unnecessary at this stage, trays can even be stacked to save space.
The strategy shifts immediately upon the appearance of seedling leaves. At this point, providing maximum light is essential to prevent the development of weak, leggy stems. Celery and celeriac are the notable exceptions to the no-light rule during germination.
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Sources
- Summary by Intellect · source: Seedling Kindergarten in Early Spring: Germination Heat, Light & Strong Growth
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