Why won't my gemcorns grow?

Your Gemcorns aren't growing because they lack sufficient space (at least 11-16 blocks vertically, with more being better) or are too close together (need 3 blocks horizontal gap), planted in the wrong layer (must be Underground/Cavern), or have player-placed background walls nearby, as they need natural stone, clear space for growth, and proper depth for the tree to reach its full height and produce gems.
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How to speed up gemcorn growth?

The saplings will grow the fastest with at least 16 tiles of room above the saplings. They will still grow with 11-15 tiles of room, but they will grow more slowly (on average).
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How do you get gemcorns to grow?

Growing conditions
  1. The sapling must be placed below surface layer.
  2. The sapling can only be planted on any Stone Block, including biome and mossy variant. At least one tile adjacent to the block the sapling is planted on also has to be one of these blocks.
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How long does it take for a gemcorn tree to grow?

In Terraria, Gemcorns grow unpredictably, taking anywhere from minutes to hours (or even days) of real time due to random chance, but they usually grow within roughly 32 in-game hours if conditions are ideal (16+ blocks of space above them in the Cavern layer). Growth is instant when it happens but relies on random checks, and fewer blocks of space slow down the process. 
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How much space does a gemcorn need to grow?

The Gemcorns must be planted with three tiles of space between saplings for both to be able to grow. Gemcorn saplings need at least 11 blocks of open space above them, but 16 is better, and 17 will avoid the topmost leaves clipping into the ceiling.
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Terraria Gemcorn Growing Tips/Tutorial

Does fertilizer work on gemcorns?

The Fertilizer is a consumable item which immediately grows a sapling or gemcorn into the corresponding tree. Each use causes the player character to throw out Fertilizer in a small area in front of them.
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How to grow gem corn?

To grow Gemcorns in Terraria, plant them on stone blocks below the surface, ensuring at least 16 blocks of clear vertical space above and 3+ blocks of horizontal space between each sapling, with no light sources or water nearby; they grow into valuable gem trees that drop gems and stone.
 
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Will gemcorns grow on the surface?

Amber Gemcorns

I checked the game code, and all gem trees will grow if planted (on stone or mossy stone) in the Underground layer (or below, meaning Caverns included), regardless of biome (or light level). They need the usual Tree growth requirements, as explained on that page.
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Do gemcorns need to be planted underground?

Yes, in the game Terraria, Gemcorns must be planted and grown in the Underground layer or below (Caverns), not on the surface, on Stone Blocks (or variants) with space for growth, and without torches directly adjacent to the sapling, though light levels don't affect growth otherwise. They need specific stone block requirements and clearance to grow into Gem Trees, providing a reliable way to farm gems.
 
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How far apart do gemcorns need to be?

If the Depth Meter says you're underground, you can grow Gem trees. If it says you're above ground, you can grow trees from acorns. If the Depth Meter says Level, you can grow both. For space between trees, 2 or 3 blocks between Gemcorns should work.
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How long does it take a tree to grow in Terraria?

In Terraria, trees grow randomly over time (usually 2-4 in-game days) once planted correctly, needing ample vertical space (9-20+ blocks clear) and sometimes growing faster when you're away, with conditions like proper block placement (grass/dirt/mud) and distance being key; it's a mix of RNG and environmental factors. 
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Does Axe of Regrowth work on gemcorns?

The Axe of Regrowth only harvests fully-grown Pumpkins. Chopping down Gem Trees will not automatically replant Gemcorns.
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Why won't my trees grow in Terraria?

Trees need 16 tiles of clearance (24 for jungle, 30 for palm) so if you had rail 12 blocks above, it would definitely have blocked the growth. So long as there's no wall immediately behind the sapling, the trees will eventually grow when you're far enough away.
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Can gemcorn trees grow above ground?

It doesn't even have to be the cavern layer, they grow perfectly fine as long as it's in the underground layer or below.
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What is the rarest gem in Terraria?

They come in seven varieties, ordered from most abundant to rarest:
  • Amber.
  • Amethyst.
  • Topaz.
  • Sapphire.
  • Emerald.
  • Ruby.
  • Diamond.
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How long do gemcorns take to grow?

In Terraria, Gemcorns grow unpredictably, taking anywhere from minutes to hours (or even days) of real time due to random chance, but they usually grow within roughly 32 in-game hours if conditions are ideal (16+ blocks of space above them in the Cavern layer). Growth is instant when it happens but relies on random checks, and fewer blocks of space slow down the process. 
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How to get gemcorns to grow?

To grow Gemcorns in Terraria, plant the saplings on stone blocks underground, ensuring at least 16 blocks of vertical clearance and 3 blocks of horizontal space between each sapling, avoiding light sources and water for optimal growth. More space (up to 4-5 blocks) between trees helps them grow faster and larger, yielding more gems.
 
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How to plant gem corn?

To grow Gemcorns in Terraria, plant them on stone blocks below the surface, ensuring at least 16 blocks of clear vertical space above and 3+ blocks of horizontal space between each sapling, with no light sources or water nearby; they grow into valuable gem trees that drop gems and stone.
 
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Can gemcorns grow in the underground layer?

Gemcorns can grow anywhere below the Surface layer. The Underground layer is fine.
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Why do farmers cut corn at night?

This is to ensure the corn kernels are as dry as possible when they are harvested and cut down on the potential for breakdowns caused by wet corn stalks. Farmers in areas of the country with extreme heat intentionally harvest some varieties of corn at night to take advantage of the cooler temperatures.
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What is the secret to growing corn?

Quick Guide to Growing Corn

Space seedlings 8 to 12 inches apart in an area with full sun and fertile, well-drained soil with a pH of 6.0 to 6.8. Improve native soil conditions by mixing in several inches of aged compost or other rich organic matter. Corn will grow quickly when it is watered well.
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