There are various methods of seed sowing that apply to plants raised in glasshouses and cold frames, but the necessary requirements for germination-moisture, warmth and air -are the same as those for sowing out of doors.

Sowing in a glasshouse is done under controlled conditions so that the question of climatic interference does not arise. Very high temperatures are not essential, nor are they conducive to the best results. Generally speaking, the seeds of many glasshouse and garden plants that are started indoors for planting out later need a temperature of only 12.5 to 15.5 C. Seeds of tropical plants like around 5 to 10 C. higher.

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