Q.how to go about plant etrog and replant in ground
how to germinate and how to take care of watering and fertilize and insects
The most likely germination method is to soak the seeds in water overnight, then plant in seed-starting soil and keep the soil moist, but not soggy, for several weeks until they germinate. As they grow, transplant to a larger pot with a citrus potting soil mix as described here:
https://www.gardeningknowhow.com/edible/fruits/citrus/growing-citrus-trees-indoors.htm
Etrog plants can then be cared for similarly to other citrus. See these articles in our citrus section:
https://www.gardeningknowhow.com/edible/fruits/lemons/growing-lemon-trees-containers.htm
https://www.gardeningknowhow.com/edible/fruits/citrus/citrus-seed-harvesting.htm
Also see this article:
https://www.gardeningknowhow.com/edible/fruits/etrog/growing-etrog-citron-trees.htm
