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Help please
Ok I need your help please relating to sowing seeds: I have two plastic greenhouses and plastic seed trays with clear lids with seed compost ready to go. All the seeds I have say temperature must be 15c to 20c and sow from March indoors. Question I have (although appreciate still probably a bit too cold to begin) i want to in a couple of weeks sow the seeds in the trays with lids then place in these greenhouses outside in the garden, will this be the correct approach.
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The plastic greenhouses don't have the same protection as glass ones Newbee so you just have to judge it. They really just keep the worst of the weather off plants rather than giving much frost protection. If you start everything indoors and have enough room, I'd pot them on and keep them in the house till they can go in your greenhouses. It's the night time temps which are the issue. However, it depends on what you're sowing and what the climate is like where you are. They'll need plenty of ventilation and light as they grow too, so the timing's quite important. If you leave them till mid to late March to start sowing, you'll probably be fine.
I live in west central Scotland - not where that photo is...
Most seeds need an ambient temperature to germinate which is why an indoor window sill or in my case a heated sand box is needed. The sand box with thermostat is curtaind off from the rest of the greenhouse with shelves above the heater so i can lift the seed boxes as they germinate not needing as much heat although still needing some warmth. A plastic or even glass greenhouse will get very cold at night this can set the seedlings back if it does not kill them. Propagators can be inexpensive for a simple one and worth the cost in good seedlings. As an example my sweet pea seeds have just gone in the sand box, some people have sown from November on, here in the NE England it would be a waste of time, so it also depends on where you live.
Hope this helps.
Frank