May can be full of ups and downs when looking after seed trays. One moment, you need to cover them if night-time temperatures drop, and on another, they dry out really quickly on sunny days. To help with the latter, I have always found that bottom watering seed trays is the most efficient way to keep them healthy and moist for longer.
When you water seed trays from the bottom, the soil soaks in all the water it needs, avoiding over- or underwatering. It also encourages strong root growth and avoids fungal diseases. It can be done either by placing them in a tray of water for 10-30 minutes or by placing trays on a matting to release moisture to them via capillary action.
