How to make a diamond from graphite. Wait, that is actually possible.

Walmart....buy a saw, shovel, and a weeping mulberry

The answer is "you can't."

Weeping mulberries are cloned from mulberries already found to be naturally weeping. You can't make one.

Unless... you use the 'normal' mulberry as a standard rootstock and graft or bud a weeping selection on at the desired height and cut off everything above that point that doesn't weep.