How does corruption spread?

Question

I've try to made artificial corruption biome in Terraria for two purposes:

• farming mobs;
• getting a lot of vile mushrooms and deathweeds;

But I want to do it accurate and limit size of corrupted area. So I'm in stuck.

Will ebonstone make next to it blocks of dirt corrupted, if I place them in such way?

Does corruption spread through corrupted grass thorns? I think that yes. Did anybody confirm it?

How big (long?) may corrupted thorns be?

Answer

You can use Corrupt Seeds on dirt to artificially create corrupted areas yourself. If you want to control how much the corruption spreads, plant Sunflowers on the left and right boundaries of your corrupt areas, as they stop the spread of Corruption.

According to this user, only Corrupt Grass spreads the Corruption (to other dirt blocks) – Ebonstone won't. However, another user states Ebonstone will in fact spread it, so I'm not sure who is correct. Thorny Bushes will spread the Corruption. I don't know if there's any data on the maximum size of Thorny Bushes.

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