planting mulberry trees saplings

What is the best way to plant mulberry tree saplings? I got some 1-2 foot long white mulberries and two red mulberries. The white ones I planted all over the garden. I planted several in a woody area on my land and they seemed to thrive. there was filtered sunlight there. The ones I put in full sun seemed to just sit there. But after a week or two, I read that saplings needed filtered sun. So I took some aluminum foil and made a "tube" of alumunum foil around the lower half of the saplings in full sun, to help cut down on the sun. I didn't wrap the trunks of the saplings with the foil, I just made a little tube of foil around them. Within a week, most of them in full sun were sprouting leaves. They mostly only sprouted leaves in the part of the trunk that was shielded with the aluminum foil, not the upper half which was still exposed to full sun. The red mulberry trees were 2-3 feet high saplings. They so far aren't doing well. their leaves turned yellow and seem to be drying. not sure why.
--Johnny
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know but I bought some black mullberry plants 8-9 inch tall at supermarket and I can't believe how slowly they grow .
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