Question about vernalization (fruit trees)

[Tam Hawkins]

Hello Everyone,

I want to make a base in which I want to grow evergreen trees for my food needs but also need deciduos trees for another project (making a giant cherry tree).

Currently I am trying to figure out if the temperature range in the place I choose is correct and would like some input from the community if I am rigth how vernalization works.

Vernalization: The fruit tree needs to be exposed to -3°C to enter dormancy. Then, while dormant it needs to be below 2-5°C (depending on the tree) for at least 220-280 in game hours. FInally when the tree leaves dormancy it will start flowering.

If I got the above rigth then here are my questions:

1. How long does it need to be below -3°C to enter dormancy. Is a night enough? an hour? does it need an entire day?

2. Does vernalization need to be consecutive or can ther be breaks? For example if the days after dormancy have an average of 14 hours below venalizaition temperature and an average of 10 hours above vernalization temperature will vernalization still happen after 20 days or will it not work?

3. I am playing on TOPS and the months are 30 days instead of 9, does that mean vernalization hours are more than 3 times as long as normal (so more than 660 hours?)

4. Can Temperatures fall under the die treeshold for a short amopunt of time? If yes how long? Would that be long enough to put the cherry trees into dormancy but short enough to not kill my other trees?

 

I am planning to have the cherry trees elevated (the fake giant tree will be on a hill so roughly +10-20 until the "tree starts" and an aditional 25-40 blocks hight for the tree itself, maybe higher if necessary) and the evergreens in green houses, maybe even set down into the ground a little (at most  8 blocks down so that the "roof" of the greenhouse lends itself as a plaza to walk on) though I would like to avoid it if that is possible. 

Thanks for reading and any answer that is given,

Tam

[Dilan Rona]

when you hover over the tree sapling with the mouse, and press h, you will get a help page detailing the sapling, and temperature tolerances. including the temperature needed to vernalise, and what temperature(s) will kill it.

[Tam Hawkins]

Hey Dilan thanks for the fast reply, but it does not answer any of my questions.

I already have all the numbers I just want to know how they exactly apply.

 

What I have figured out by now:

Vernalization time in the code is noted as hours. While crops which are invluenced by lengthening months are denoted as factors of months (like 1,5 months lenght). Instead vernalization is given in hours (vernalizationHours: { avg: 250, var: 30 }). Therefore I assume the answer to question number 3 is that length of months does not affect vernalization time. Which is great for me but makes me wonder how fruit trees are supposed to work if someone sets the days per month really low.

 

For the other questions I am left guessing though.

Question 1 + 4: I cannot find how the progress of checking for temperatures for dormancy, die below and vernalization is done. Is it a single tick and if the temperature fits it immediatly goes dormant/dies/adds a number of hours to vernalization (last one maybe dependant on the last check?). For now I assume that a single tick below the temperature triggers dormancy/death.

Question 2: I also cannot find in the code how vernalization works. some users claim that it does not need to be all in one step so I assume that as long as the tree does not leave dormancy it will resume vernalization of the temperature drops again but I do not know. Maybe I chould make a test world and use commands to test it... now I just have to figure out how to do that