IÂ´m interested to see how you pre grow your seedlings, if any do? You maybe have some advise to give me. Here is how i do it. In lack of a proper greenhouse i use my storage room in the house. I put the seedling trays at the floor wich is heated,when they start to pop up i put them under florucent lighting. In the little aqvarium i have some more delicate spieces like magnolia kobus borealis and delonix regia. Note the wall of snow outside the window. After the acers get there 4 coupple of main leafs i transfer them to the garage which is cooler, but well lit. Than i hope for survival. When or If? should i start to fertilize the seedlings?