"Sun hostas" refer to specific hosta varieties, like 'Sun Power' or the SunHosta™ series, bred for enhanced sun tolerance, allowing them to handle more than the typical partial shade, with golden, chartreuse, or white-edged leaves often brightening in more sun, though most still prefer morning sun or consistent moisture to prevent scorching, especially in hot climates. Key sun-tolerant types include yellow/gold varieties for brightness and thick-leaved types, with SunHosta™ being a standout for full sun and heat.