The Growing Standing Stone is a block added by Roots. It will make all crops inside its 9 block radius grow faster when powered by Redstone. Each 50 ticks (or 2.5 seconds), there is a 5% chance of the "age" of the crop increasing by one (most crops have an age of 7 when fully grown).
You've used standing stones to channel life energy before, but never on their own. However, using the innate power within an infernal bulb and the regenerative effects of a ritual, you have created standing stones that will perform a simple purpose in an area around them forever, without cost.
The grower stone will slightly boost the growth speed of nearby crops.
— Runic Tablet
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