Answer: There are some very small weeping crab varieties available, but these and most other ornamental trees grow best in full sun. In not too long, the maple tree should grow very large and shade the area. It will also compete with other plants for water and nutrients, so in the long run the smaller tree will not do well. You might consider an ornamental shrub instead, since these may be more tolerant of shade and the difficult growing conditions and will also stay closer to the size range you desire. Some to consider might be peegee hydrangea, the dwarf lilac "Miss Kim", red barberry, or a "Snowmound" spirea.
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