I had this issue when building a putting green for a huge office building I am making. Grass needs to touch other grass to grow and Light. I had to lay dirt from the outside bottom level and make a dirt staircase up to the top floor of the building. Put torches on the blocks and watch it grow slowly to where I needed it.
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Heh - And I used to be the one saying "Really? You're playing NerdCraft??"
you can use pistons to move a grass block where ever you want. To push it down you need to have a glass block in between the piston and grass, or the piston will make the grass go away and you will be left with a regular dirt block. I don't know if grass will spread without the sun though. I don't even know if this actually works for that matter, another forum member posted this technique and i haven't gotten around to trying it for myself.
How can I get grass to grow underground because I am making a underground garden.
If you make sure that there are a continuous string of dirt blocks between where you want the grass to grow and where it is already growing, the grass will spread from one block to the next. If the strip is only 1 block wide, it will spread VERY, very slowly. If you can make the strip of dirt blocks wider (say 3 blocks wide) the grass wil spread more quickly. You will also need to provide light along the strip to compensate for the lack of sunlight along the way. It will also be quicker if you take as direct a route as possible between the area where you already have grass and the area where you want the grass to be. So, for example, rather than meandering the strip through caverns, dig a wide staircase directly to surface and cover each step with dirt blocks. Then once the grass has made the journey, just fill the staircase back in if you don't want to use it anymore.
Everything that's been said and . . . you don't have to go too crazy with the torches. I did a staircase down to bedrock and used a ton of them. It wasn't necessary and doesn't make the grass grow any faster. Every 4th step works fine.
The thing to keep in mind is that grass doesn't "grow".
It spreads.
Grass will spread to a dirt block if it's within 3 blocks of a dirt block with grass on it.
Yes, sometimes it takes a while, other times almost instantly. However, once you get even one block to have grass on it "down there", you can delete your "grass stairway" as it's not needed anymore. If you have light "down there", the grass will be fine.
We had this same problem on our underwater dome build.
Two of us wanted to incorporate trees and gardens into our sections of the cities so we had to link a dirt staircase from sea level down to Y:33 the base of our dome, it is still spreading into the adjacent wings or sections of the city. We keep it well lit and it spreads but at a snails pace.
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Read the Growth paragraph (:
If you make sure that there are a continuous string of dirt blocks between where you want the grass to grow and where it is already growing, the grass will spread from one block to the next. If the strip is only 1 block wide, it will spread VERY, very slowly. If you can make the strip of dirt blocks wider (say 3 blocks wide) the grass wil spread more quickly. You will also need to provide light along the strip to compensate for the lack of sunlight along the way. It will also be quicker if you take as direct a route as possible between the area where you already have grass and the area where you want the grass to be. So, for example, rather than meandering the strip through caverns, dig a wide staircase directly to surface and cover each step with dirt blocks. Then once the grass has made the journey, just fill the staircase back in if you don't want to use it anymore.
It spreads.
Grass will spread to a dirt block if it's within 3 blocks of a dirt block with grass on it.
Yes, sometimes it takes a while, other times almost instantly. However, once you get even one block to have grass on it "down there", you can delete your "grass stairway" as it's not needed anymore. If you have light "down there", the grass will be fine.
Two of us wanted to incorporate trees and gardens into our sections of the cities so we had to link a dirt staircase from sea level down to Y:33 the base of our dome, it is still spreading into the adjacent wings or sections of the city. We keep it well lit and it spreads but at a snails pace.