Sun rate: Low, then normal
Mushroom: Sleeps during the day
Unlocked: After beating Level 2-1
Planted On: Ground, Lily Pad, Flower Pot
These work just like Sunflowers, but produce sun at night. They are available after beating Level 1-10. These plants cost less than Sunflowers, but only produce 15 sun per cycle instead of 25 for the first 2 minutes. After 2 minutes, the Sun-Shroom grows to become a larger mushroom and starts producing 25 sun at a time.
Remember that just because Sun-Shrooms only produce 15 sun, they cost less, so planting 2 Sun-Shrooms for the cost of one Sunflower will give 30 sun at a time instead of 25.