Minecraft wiki entry for Grass, associated text: Grass cannot be directly set on fire from lightning. However, fire from nearby blocks can spread to it. Oddly enough, the top of grass can be lit but it does not burn this way. When any kind of grass is set on fire, the fire seems to hover just over the grass, as if it were a full block.
Even though ferns do not produce seeds in real life, as they emit spores instead, they can drop seeds if broken.
Grass is slightly offset from the block it is sitting on (as seen in the second screenshot). This causes fields of grass to appear more contiguous.
This offset is solely determined by x and z coordinates, regardless of dimension or world seed[verify]. Based on this feature, it is possible to calculate the coordinates where a screenshot is taken, if the screenshot includes enough grass.
This can sometimes cause grass to clip horizontally or vertically through block corners.[6]
Grass can appear in caves on dirt, even if there's no light source nearby.
Using bone meal on grass in a spawn-protected area on a server still produces grass and flowers.
The texture for grass is based on the grass texture from an early version of one of Notch's games, Prelude Of The Chambered