A few patches back, Notch made it so cacti can be placed only on sand blocks.
However, there are a few simple ways to get around this. If the block you are attempting to place the cactus on is covered in snow or water, the cactus can be placed. So cacti can be placed on any block by either covering them with water with a bucket, or exposing the block to the air on a snow map.
It's pretty minor as bugs go I know, but it can be exploited for aesthetic reasons.
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However, there are a few simple ways to get around this. If the block you are attempting to place the cactus on is covered in snow or water, the cactus can be placed. So cacti can be placed on any block by either covering them with water with a bucket, or exposing the block to the air on a snow map.
It's pretty minor as bugs go I know, but it can be exploited for aesthetic reasons.
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