Is white palm a negative or positive feng shui?

It is positive Feng Shui.

White palm is a masculine plant and can be placed in the bathroom where dirt is collected, but it cannot be placed directly opposite the bathroom door.

White palm is a shade-loving plant. It grows well in a moist and cool environment and can accept appropriate scattered light. It should block 60%-70% of the sun at noon in summer, and the weather is cool in the evening or early morning. Just add light from time to time.