When seedlings are young they are like babies. They must be hardened off before they can be put in full sunlight or they will die. Commercially they use a little plastic tent but what you need to do is partly shade them and gradually expose them to more light and cold untill they are hardened off and can take it.

Ernestine,

I do not have any hard data, because I have been gardening for so many years and most of my stuff I have just picked up. Last year I was watching The Miracle Garden on 3ABN with Ian Jones (now off the air) and he recommended lots of Epsom Salts for yellowing leaves, which was a problem I was having at that time.

This year I made sure to add extra Epsom Salts when I built my soil, but I still had some yellowing of leaves. With all the liver/gall bladder flushes I have been doing and reading about the major importance of magnesium in our diet and how most of us are deficient, I added even extra Epsom Salts to the garden a few days ago. We have had some rain, and the plants are a richer, deeper green and they have absolutely taken off in a growth spurt. I also side dressed with compost, so I'm sure that helped as well.

I do not know if magnesium can be seriously overdone in the garden. I suppose the plants will just take up what they need. I do not know if it will make the soil too alkaline.

Would love to hear from others on this subject. Thanks.

bevpirt

From a strictly chemical standpoint, Epsom Salts is just magnesium and sulfur. Magnesium is a nutrient required by plants, as is sulfur; both in trace (very small)amounts. If there is a deficiency of either then the plant will not strive very well.
I personally don't believe that it is strictly a chemical thing, but would accept that it is an ionic (electromagnetic) thing. I just don't have any proof of it.
Sulfur is used to shift pH toward the acid side and tomatoes seem to like acidic soil according to the experts. Yellowing of leaves is one indicator of chlorosis which may be an indicator in blueberries that the soil is too alkaline.
Other uses of Epsom Salts suggests that there is some unknown or unadmitted effect of it. We have a lot to learn and we can start if we just admit that we can't explain everything by using scientific methods. I'm not poopooing science, just suggesting that we have to think weirdly to understand "weird" things.