Harsh Sunny Tile

A Harsh Sunny Tile is a type of Weather Tile, which has similar properties as a normal Sunny Tile in that they spread Sunlight in a certain range.

However, Harsh Sunny Tiles have a side effect that they cause draught in the Flowers they touch, meaning they now require more Shade than Sunlight in order to Bloom rather than the other way around.

In Sunny Side Up: Cubed
In the Cubed version of the game, Harsh Suns have a range of 2 spaces, like normal Suns have.

Technically, the Cube doesn't have Tile at all. Internally, they're still referred to as Harsh Sunny Tiles however.