I intend to cultivate lavender for extraction of lavender oil in Nilgiris district of Tamil Nadu in India. temp ranges from 12 to 30 C day. Presently growing carnation flowers in greenhouse. Area available is 10 acres. Soil 5 to 6 ph.

Assuming you have the land? Depends on how many plants you can plant on that plot. Figure out how many you can safely plant. Lavender can grow well bunched together, so that's a plus for the growerYou have not given enough detail. You must figure out the following: What is the climate you live in? Do you have an adequate water and fertilize system to handle that many plants? How much time are you going to put in on this? By commercial do you mean 1 acre? Or 40? Can you afford to lose the money you put in if all the plants die? Do you plan on hiring other people? Do you have the tools you will need in caring for these plants? Do you know how much dirt and the number of pots you need when it comes time to dig these plants up and sell them? Have you checked the soil where you are going to plant? Does it need any fillers to make it the best possible for the plants to grow? Have you checked into any type of license you might need to do this? Do you want me to shut up now? Need more detail.