Evergreen spindle has a moderate water requirement, preferring a consistently moist but well-draining soil. The key is to provide enough water to keep the soil evenly moist without saturating it. Factors like pot size, root depth, and plant size can influence the amount of water needed. Larger pots have a greater water-holding capacity and may require more water, while smaller pots dry out faster and may need more frequent watering. As for root depth, evergreen spindle has a shallow root system, so a thorough watering session that wets the top 6-8 inches of soil should be sufficient. In terms of plant size, larger evergreen spindle plants may require more water to meet their needs.