Block active = block;
if(block.getType() == Material.CACTUS || block.getType() == Material.SUGAR_CANE_BLOCK){
    moreBlocks = true;
    List<Location> breakBlocks = new ArrayList<Location>();
    do{
        Block above = active.getRelative(BlockFace.UP);
        if(above.getType() == Material.CACTUS || block.getType() == Material.SUGAR_CANE_BLOCK){
            breakBlocks.add(above.getLocation());
        }else{
            moreBlocks = false;
        }
        active = above;
    }while (moreBlocks);
    for(int i = breakBlocks.size() - 1; i > -1; i--){
        // My own logic, works fine
    }
}