I've set up a chlorophyte farm and it is growing chlorophyte. Is there a way to speed up its growth? Does anything govern its growth?
The farm has to be in the underground layer or lower, and the chlorophyte will grow at a rate of about 1 ore per hour. Also, it seems that chlorophyte will grow when you kill Plantera, so you can check conditions by killing Plantera and then check the farm.
The farm's layout can affect growth rate, too. This question might be helpful for layout information.
I just made 6 5x5 mud blocks with 1 chlorophyte ore each in the center. The "squares" are 2 blocks away from each other and have 4 torches each. Seems to be working fine..Got about 5 grown ore in less than 5 minutes. I recommend reducing the space in the cave you made around the "squares" because I think it is related to the ore's growth. I tried it twice and got more ore if the space around the cave is narrow.