Re: Salad growing in a coldframe
Not sure if you mean an enclosed cold frame on a hard surface or one on soil - I grow most of my salad in cold frames on soil, easier to protect from slugs especially in the early stages. I use a garden not an allotment and I am retired so watering and controlling ventilation are not an issue.
My first crop we are just finishing was grown in cold frame in cold greenhouse (cgh), frame moved outside some weeks ago.
Here is the batch we are about to start on.
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At the far side are Spring Onions started in heated greenhouse (hgh) 18th Feb.
Nearest are various Lettuce (I grow several varieties to mature at different times so sow less frequently than often suggested), sown in hgh 11th March, moved to cgh 25th then planted in here on 8th April. Between them are Radish, Rocket and Greek Cress sown in the cold frame on 1st April.
To follow on I have another cold frame.
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Lettuce sown in cgh 2nd April, planted in cold frame on 2nd May when Rocket and Greek Cress were also sown.
And so it goes on through the summer - sometimes growing some outside but usually moving a cold frame to a new patch.
Hope that helps!