Crop Growth

Rules

Growth timing	Crops grow on random ticks: at random moments, on average once every 68.27 seconds per block at the default random tick speed of 3. Each random tick is one growth try.
Light needed	Light level 9 or higher to grow. Light level 8 or higher to stay planted.
Planted on	Wheat Crops, Carrots, Potatoes, Beetroots and Torchflower Crops need Farmland underneath.
Growth points	A crop starts with 1 point. The Farmland under it adds 1 when dry or 3 when hydrated.
Surrounding Farmland	Each of the 8 Farmland blocks around the one under the crop adds 0.25 when dry or 0.75 when hydrated.
Same-crop penalty	The points are halved if the same crop grows diagonally next to it, or next to it both in the north-south and in the east-west direction. A single row with no same crop beside it is not halved.
Growth chance	Each growth try succeeds with a chance of 1 in (25 ÷ points, rounded down, plus 1).
Best case	Hydrated Farmland under the crop and all around it, without the penalty: 10 points, 1 in 3 per try.
Dry case	Dry Farmland under the crop and all around it, without the penalty: 4 points, 1 in 7 per try.
Single block	One Farmland block with no Farmland around it: 4 points (1 in 7) when hydrated, 2 points (1 in 13) when dry.
Beetroots and Torchflower	For Beetroots and Torchflower Crops, 1 in 3 growth tries is skipped before the normal chance is rolled.