Seed Bed - What is it in real life please

I read a lot about using a seed bed and despite talking to fellow allotmenteers I cant seem to get a consensus of
1. What it looks like
2. Is it worth using
3. Is a permanent fixture
Help please friends as I am trying be better this season
1. What it looks like
2. Is it worth using
3. Is a permanent fixture
Help please friends as I am trying be better this season

Everyone is just trying to be Happy.
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Posts
Often an area out of the way of the main garden that's used as an outdoor nursery.
Say you want to sow foxgloves outside.
In June you sow the seed in the prepared Seed bed.
When the seedlings appear, thin them and grow them on a bit until July/August, then you could move them to your Nursery bed to grow on a bit more before planting out in the garden in Autumn or Spring.
I use a spare area in my veg patch for Nursery bed for perennials that I've sown in the greenhouse
Wisdom is not putting it in a fruit salad.
Does temperature and positioning re wind and shelter etc matter
I have a conservatory and heated mats from the pet shop as my current option
I often start my hardy perennials such as foxgloves, delphiniums aquilegia etc in a short row in the veg patch and prick them out and grow them on there until they’re ready to be planted into their permanent positions.
I also grow brassicas in the same way.
However, it seems from your last question that you just want to sow some seeds. If you can tell us what seeds you want to sow, we will be able to tell you where to sow them. You can quite happily sow seeds anywhere from in a pot on the kitchen windowsill to outside in a properly prepared seed bed. The main requirement is that all locations should be sheltered, in good light and well-tended.
So tell us what you want to grow and we will take it from there.