Around 7-9 weeks ago (maybe more) I planted a sprouted apple seed in a cup of potting soil that I placed on top of a low heat pad, and covered it with a plastic bag. I also have a full spectrum fluorescent on it, and both are on a timer for 12 hours per day.
It grew fast and well so a while ago I decided to remove the bag to slowly get it used to the room, which has a temperature of 72 degrees with 45 percent humidity. Shortly after I removed the bag the leaves shriveled up and died. I quickly re-covered it and the next day I saw that it had continued to grow. Being scared it would die off, I left it covered and it grew bigger. It's now 7 inches tall and has 8 big leaves. Yesterday, thinking it must be a lot stronger now, I again removed the plastic bag, but, sadly, in an hour (maybe less) the leaves shriveled up again. Not wanting it to die again, I quickly covered it and added a little water, and my fast action saved most of the plant.
I want to know what I am doing wrong here. Why is it shriveling up under the light? Is the light too strong for the seedling to be exposed under it? Do I have to add fertilizer? Is it going into shock? Do I simply have to wait until it’s bigger?
I will add pictures later today. Thanks for all your help :)
This one is from the Apple seedling I have this uncovered for 10 min when I started to see the newest leaves start to curl:
This one is a pear seedling:
This one has 2 the closer one is a papaya and the other one is a peach:
Last but not least is a mango and as you can see I left it out a tad to long and some leafs started to curl: